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standard-deviation
Recent questions tagged standard-deviation
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1
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What is Standard Deviation?
What is Standard Deviation?
MathsGee
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MathsGee
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Jan 31
AI & Data Science
calculate
distribution
math
solve
standard-deviation
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208
views
1
answers
What is a confidence interval?
What is a confidence interval?
MathsGee
Platinum
113k
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MathsGee
asked
Oct 11, 2023
AI & Data Science
interval
confidence
calculate
standard-deviation
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500
views
1
answers
What is a population standard deviation?
What is a population standard deviation?
Maths-Genie
Bronze Status
9.4k
points
Maths-Genie
asked
Mar 14, 2023
AI & Data Science
standard-deviation
mean
distribution
calculate
sample
statistics
data
+
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373
views
1
answers
What is the coefficient of variation in statistics?
What is the coefficient of variation in statistics?
AstraNova
Diamond
67.9k
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AstraNova
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Feb 6, 2023
AI & Data Science
statistics
variation
standard-deviation
coefficient
mean
variables
variable
+
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534
views
1
answers
What is the interquartile range in statistics?
What is the interquartile range in statistics?
AstraNova
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67.9k
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AstraNova
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Feb 6, 2023
AI & Data Science
range
interquartile
distribution
calculate
variance
probability
standard-deviation
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333
views
1
answers
What is the standard deviation in statistics?
What is the standard deviation in statistics?
AstraNova
Diamond
67.9k
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AstraNova
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Feb 6, 2023
AI & Data Science
calculate
standard-deviation
mean
variance
distribution
sample
#distribution
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–
401
views
1
answers
What is the concept of hypothesis testing in statistics?
What is the concept of hypothesis testing in statistics?
AstraNova
Diamond
67.9k
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AstraNova
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Feb 6, 2023
AI & Data Science
hypothesis
testing
perform
calculate
distribution
probability
standard-deviation
+
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343
views
1
answers
What is the p-value associated with a z-score of 2.5 in a standard normal distribution?
What is the p-value associated with a z-score of 2.5 in a standard normal distribution?
AstraNova
Diamond
67.9k
points
AstraNova
asked
Jan 27, 2023
Mathematics
standard-deviation
variance
calculate
normal
distribution
data
average
+
–
359
views
1
answers
What is a p-value and how is it used in statistical testing?
What is a p-value and how is it used in statistical testing?
MathsGee
Platinum
113k
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MathsGee
asked
Dec 6, 2022
AI & Data Science
calculate
probability
distribution
standard-deviation
hypothesis
testing
perform
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521
views
1
answers
What is hypothesis testing and how is it used in statistics?
What is hypothesis testing and how is it used in statistics?
MathsGee
Platinum
113k
points
MathsGee
asked
Dec 6, 2022
AI & Data Science
hypothesis
testing
perform
calculate
distribution
probability
standard-deviation
+
–
523
views
1
answers
What is the normal distribution and how is it used in statistics?
What is the normal distribution and how is it used in statistics?
MathsGee
Platinum
113k
points
MathsGee
asked
Dec 6, 2022
AI & Data Science
standard-deviation
variance
calculate
distribution
normal
probability
sample
+
–
445
views
1
answers
How can we use probability to make predictions or draw conclusions from a sample of data?
How can we use probability to make predictions or draw conclusions from a sample of data?
MathsGee
Platinum
113k
points
MathsGee
asked
Dec 6, 2022
AI & Data Science
probability
calculate
distribution
variance
normal
standard-deviation
number
+
–
519
views
1
answers
Calculate the median of the following test scores.
Calculate the median of the following test scores.\(\begin{array}{lllllllll}18 & 11 & 12 & 13 & 15 & 17 & 12 & 25 & 12\end{array}\)
MathsGee
Platinum
113k
points
MathsGee
asked
Nov 27, 2022
Mathematics
data
calculate
average
standard-deviation
#distribution
#probabilty
#statistics
+
–
577
views
1
answers
Calculate the mean of the following test scores.
Calculate the mean of the following test scores.\(\begin{array}{lllllllll}11 & 12 & 12 & 12 & 13 & 15 & 17 & 18 & 25\end{array}\)
MathsGee
Platinum
113k
points
MathsGee
asked
Nov 27, 2022
Mathematics
calculate
data
standard-deviation
#distribution
#probabilty
#statistics
average
+
–
362
views
1
answers
What is the standard normal distribution?
What is the standard normal distribution?
AstraNova
Diamond
67.9k
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AstraNova
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Jul 23, 2022
AI & Data Science
standard
normal
distribution
standard-deviation
variance
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348
views
1
answers
What is the normal distribution?
What is the normal distribution?
AstraNova
Diamond
67.9k
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AstraNova
asked
Jul 23, 2022
AI & Data Science
distribution
normal
standard-deviation
calculate
variance
probability
+
–
794
views
1
answers
A juice company sells its product in either a 48 -ounce size or a 32 -ounce size. It charges \(\$ 3.90\) for the 48 -ounce size.
A juice company sells its product in either a 48 -ounce size or a 32 -ounce size. It charges \(\$ 3.90\) for the 48 -ounce size. How much should it charge for the smaller...
MathsGee
Platinum
113k
points
MathsGee
asked
Jul 7, 2022
Mathematics
calculate
normal
variance
standard-deviation
distribution
interest
rate
+
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227
views
0
answers
An engineer was assigned the task of calculating the average time spent by vehicles waiting at traffic signals.
An engineer was assigned the task of calculating the average time spent by vehicles waiting at traffic signals. The signal timing (in seconds) would then be modified to r...
AstraNova
Diamond
67.9k
points
AstraNova
asked
Jun 17, 2022
AI & Data Science
mean
#calculate
solve
calculate
standard-deviation
time
physics
+
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397
views
0
answers
The output of an instrument is often a waveform. Calculate sample standard deviation \(s\).
The output of an instrument is often a waveform. With the goal of developing a numerical measure of closeness, scientists asked 11 experts to look at two waveforms on the...
AstraNova
Diamond
67.9k
points
AstraNova
asked
Jun 17, 2022
AI & Data Science
sample
deviation
standard
variance
marketing
firm
standard-deviation
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250
views
0
answers
Is the influence of a single outlier greater on the sample range or the interquartile range? Explain.
Is the influence of a single outlier greater on the sample range or the interquartile range? Explain.
AstraNova
Diamond
67.9k
points
AstraNova
asked
Jun 17, 2022
AI & Data Science
calculate
number
probability
standard-deviation
variance
normal
distribution
+
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450
views
0
answers
Is the influence of a single outlier greater on the mean or the median? Explain.
Is the influence of a single outlier greater on the mean or the median? Explain.
AstraNova
Diamond
67.9k
points
AstraNova
asked
Jun 17, 2022
AI & Data Science
calculate
distribution
number
standard-deviation
variance
normal
probability
+
–
539
views
1
answers
What is the coefficient of variation?
What is the coefficient of variation?
AstraNova
Diamond
67.9k
points
AstraNova
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Jun 17, 2022
AI & Data Science
coefficient
variation
standard-deviation
variable
mean
variables
statistics
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481
views
0
answers
How is it that data from a normal distribution that is more than 2 standard deviations from the mean is 5%? It seems to contradict the 68-95-99.7 rule.
How is it that data from a normal distribution that is more than 2 standard deviations from the mean is 5%? It seems to contradict the 68-95-99.7 rule.
AstraNova
Diamond
67.9k
points
AstraNova
asked
Mar 8, 2022
AI & Data Science
standard-deviation
calculate
variance
sample
probability
+
–
621
views
1
answers
If mean \(=62\) and standard deviation \(=6\), then what is \(P(56<x<68)=?\)
If mean \(=62\) and standard deviation \(=6\), then what is \(P(56<x<68)=?\)
AstraNova
Diamond
67.9k
points
AstraNova
asked
Mar 8, 2022
AI & Data Science
standard-deviation
mean
calculate
#distribution
#statistics
distribution
#probabilty
+
–
1.1k
views
1
answers
A group of test scores has a mean of 75 and a standard deviation of 8 . If 7 points are added to every score in the group, what will happen to the mean and standard deviation?
A group of test scores has a mean of 75 and a standard deviation of 8 . If 7 points are added to every score in the group, what will happen to the mean and standard devia...
AstraNova
Diamond
67.9k
points
AstraNova
asked
Mar 8, 2022
AI & Data Science
standard-deviation
calculate
z-score
#distribution
#probabilty
#statistics
+
–
699
views
1
answers
Given that the mean is equal to 75 with a standard deviation of \(5.3\) what scores belong to the middle of \(28 \%\) of the population?
Given that the mean is equal to 75 with a standard deviation of \(5.3\) what scores belong to the middle of \(28 \%\) of the population?
AstraNova
Diamond
67.9k
points
AstraNova
asked
Mar 8, 2022
AI & Data Science
standard-deviation
distribution
calculate
normal
average
variance
data
+
–
836
views
1
answers
If a population has a mean of 75 and a standard deviation of 15, What is the mean of the sampling distribution for samples of size 25?
If a population has a mean of 75 and a standard deviation of 15What is the mean of the sampling distribution for samples of size 25? What is the standard error of the sam...
Tekka
Tekka
asked
Mar 7, 2022
AI & Data Science
statistics
stands
standard-deviation
mean
sampling
distribution
statistic
+
–
843
views
1
answers
A restaurant claims that the waiting time of customers for service is normally distributed with a mean of 3 minutes and a standard deviation of 1 minute.
A restaurant claims that the waiting time of customers for service is normally distributed with a mean of 3 minutes and a standard deviation of 1 minute. The quality assu...
AstraNova
Diamond
67.9k
points
AstraNova
asked
Jan 8, 2022
AI & Data Science
standard-deviation
calculate
distribution
normal
probability
#distribution
mean
+
–
434
views
1
answers
What are confidence interval?
What are confidence interval?
MathsGee
Platinum
113k
points
MathsGee
asked
Jan 3, 2022
AI & Data Science
confidence
interval
calculate
standard-deviation
#statistics
+
–
786
views
1
answers
How do you calculate the Coefficient of Variation and if the \(\mathrm{CV}\) is lower what does that mean?
How do you calculate the Coefficient of Variation and if the \(\mathrm{CV}\) is lower what does that mean?
MathsGee
Platinum
113k
points
MathsGee
asked
Nov 3, 2021
General Knowledge
coefficient
standard-deviation
variation
mean
variable
variables
statistics
+
–
494
views
1
answers
What is the Coefficient of variation?
What is the Coefficient of variation?
MathsGee
Platinum
113k
points
MathsGee
asked
Nov 3, 2021
General Knowledge
coefficient
variation
standard-deviation
mean
variable
variables
statistics
+
–
542
views
1
answers
When is standard deviation a good measure and when is it not?
When is standard deviation a good measure and when is it not?
MathsGee
Platinum
113k
points
MathsGee
asked
Nov 3, 2021
General Knowledge
standard-deviation
calculate
#distribution
#probabilty
#statistics
mean
z-score
+
–
540
views
1
answers
What is standard deviation?
What is standard deviation?
MathsGee
Platinum
113k
points
MathsGee
asked
Nov 3, 2021
General Knowledge
standard-deviation
calculate
#statistics
#probabilty
#distribution
distribution
normal
+
–
1.2k
views
1
answers
According the the U.S. Department of Education, full-time graduate students receive an average salary of \$12,800. The dean of graduate studies at a large state university in PA claims that his graduate students earn more than this.
According the the U.S. Department of Education, full-time graduate students receive an average salary of \$12,800. The dean of graduate studies at a large state universit...
MathsGee
Platinum
113k
points
MathsGee
asked
Oct 13, 2021
AI & Data Science
education
students
salary
gradute
standard-deviation
claim
+
–
723
views
1
answers
The mean score of 12 students is 42 with a standard deviation of 2 . If each score is increased by 2 points, what will happen to the standard deviation?
The mean score of 12 students is 42 with a standard deviation of 2 . If each score is increased by 2 points, what will happen to the standard deviation? DoubledDecreased...
Student
Bronze Status
5.8k
points
Student
asked
Sep 27, 2021
Mathematics
calculate
standard-deviation
#statistics
#distribution
#probabilty
mean
z-score
+
–
562
views
1
answers
What are Z-scores?
What are Z-scores?
MathsGee
Platinum
113k
points
MathsGee
asked
Jul 25, 2021
AI & Data Science
calculate
real
standard-deviation
data
distribution
normal
#distribution
+
–
763
views
1
answers
What is the relationship between standard deviation and standard variance?
What is the relationship between standard deviation and standard variance?
MathsGee
Platinum
113k
points
MathsGee
asked
Jul 23, 2021
AI & Data Science
standard-deviation
variance
relationship
statistics
dispersion
calculate
distribution
+
–
1.2k
views
1
answers
Given a left-skewed distribution that has a median of 60, what conclusions can we draw about the mean and the mode of the data?
Given a left-skewed distribution that has a median of 60, what conclusions can we draw about the mean and the mode of the data?
Student
Bronze Status
5.8k
points
Student
asked
Jul 23, 2021
AI & Data Science
distribution
calculate
standard-deviation
variance
normal
probability
number
+
–
3.0k
views
1
answers
What is the relationship between mean and median in a normal distribution?
What is the relationship between mean and median in a normal distribution?
Student
Bronze Status
5.8k
points
Student
asked
Jul 23, 2021
AI & Data Science
distribution
calculate
normal
standard-deviation
variance
#distribution
#statistics
+
–
1.8k
views
1
answers
If a distribution is skewed to the right and has a median of 20, will the mean be greater than or less than 20?
If a distribution is skewed to the right and has a median of 20, will the mean be greater than or less than 20?
Student
Bronze Status
5.8k
points
Student
asked
Jul 23, 2021
AI & Data Science
distribution
calculate
standard-deviation
normal
variance
number
probability
+
–
1.0k
views
1
answers
Imagine that Jeremy took part in an examination. The test is having a mean score of 160 , and it has a standard deviation of 15 . If Jeremy's z-score is $1.20$, what would be his score on the test?
Imagine that Jeremy took part in an examination. The test is having a mean score of 160 , and it has a standard deviation of 15 . If Jeremy's z-score is $1.20$, what woul...
Student
Bronze Status
5.8k
points
Student
asked
Jul 23, 2021
AI & Data Science
standard-deviation
mean
z-score
#distribution
#probabilty
#statistics
calculate
+
–
707
views
1
answers
What is the meaning of standard deviation?
What is the meaning of standard deviation?
Student
Bronze Status
5.8k
points
Student
asked
Jul 23, 2021
AI & Data Science
standard-deviation
calculate
#statistics
#probabilty
#distribution
distribution
normal
+
–
611
views
1
answers
Sally earned scores of 60, 65, 65, and 80 on 4 tests. How would scoring 100 on a fifth test affect the mean?
Sally earned scores of 60, 65, 65, and 80 on 4 tests. How would scoring 100 on a fifth test affect the mean?
MathsGee
Platinum
113k
points
MathsGee
asked
Jul 20, 2021
AI & Data Science
standard-deviation
calculate
#distribution
#probabilty
#statistics
distribution
normal
+
–
1.7k
views
1
answers
A sample of size 64 is drawn by simple random sampling from a normal population which has known variance 4 .
A sample of size 64 is drawn by simple random sampling from a normal population which has known variance 4 . The sample mean is $-0.45$. Test the hypothesis $\mathrm{H}_{...
Maths-Genie
Bronze Status
9.4k
points
Maths-Genie
asked
Jun 17, 2021
AI & Data Science
data
normal
calculate
standard-deviation
average
distribution
variance
+
–
690
views
1
answers
Derive a $95 \%$ confidence interval for the mean conversation length. Test whether the mean length of a conversation is eight minutes.
A firm investigates the length of telephone conversations of their office staff. Ten consecutive conversations had lengths, in minutes:$$\text { 10.7, } 9.5,11.1,7.8,11.9...
Maths-Genie
Bronze Status
9.4k
points
Maths-Genie
asked
Jun 17, 2021
AI & Data Science
calculate
data
average
standard-deviation
#distribution
#statistics
#probabilty
+
–
2.3k
views
1
answers
James is a teacher in a small school is Boston. He is amused to find that his data is normally distributed, with 30 of his students taking a test which has 70 points.
James is a teacher in a small school is Boston. He is amused to find that his data is normally distributed, with 30 of his students taking a test which has 70 points. The...
MathsGee
Platinum
113k
points
MathsGee
asked
Jun 16, 2021
AI & Data Science
mathematics
measurements
literacy
#distribution
#probabilty
#statistics
standard-deviation
+
–
1.4k
views
1
answers
A random sample is taken and the sample size is $25 .$ The sample is normally distributed, the sample mean is 89 , and the standard deviation is $5.5 .$ Find a $90 \%$ confidence interval for the population mean.
A random sample is taken and the sample size is $25 .$ The sample is normally distributed, the sample mean is 89 , and the standard deviation is $5.5 .$ Find a $90 \%$ co...
MathsGee
Platinum
113k
points
MathsGee
asked
Jun 16, 2021
AI & Data Science
#distribution
#probabilty
#statistics
standard-deviation
calculate
data
average
+
–
2.1k
views
1
answers
The mean of the medical test is $72.21$ with the standard deviation of $2.5 .$ Find a $95 \%$ confidence interval for a random sample of 25 students with the following scores.
The mean of the medical test is $72.21$ with the standard deviation of $2.5 .$ Find a $95 \%$ confidence interval for a random sample of 25 students with the following sc...
MathsGee
Platinum
113k
points
MathsGee
asked
Jun 16, 2021
AI & Data Science
#distribution
#probabilty
#statistics
calculate
data
average
standard-deviation
+
–
5.3k
views
1
answers
In a college class, the average IQ is 115. Assume that the distribution is normal and that the standard deviation is 15. What percentage of the class has IQ between 105 and 130 ?
In a college class, the average IQ is 115. Assume that the distribution is normal and that the standard deviation is 15. What percentage of the class has IQ between 105 a...
MathsGee
Platinum
113k
points
MathsGee
asked
Jun 16, 2021
AI & Data Science
distribution
standard-deviation
normal
calculate
#distribution
#statistics
#probabilty
+
–
1.3k
views
1
answers
Given $I Q$ scores are approximately normally distributed with a mean of 100 and a standard deviation of 15, the proportion of people with $I Q$ s above 130 is:
Given $I Q$ scores are approximately normally distributed with a mean of 100 and a standard deviation of 15, the proportion of people with $I Q$ s above 130 is:
MathsGee
Platinum
113k
points
MathsGee
asked
Jun 16, 2021
AI & Data Science
#distribution
#probabilty
#statistics
standard-deviation
distribution
normal
calculate
+
–
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