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Measure of Variability
Related Topics
Wize University Statistics Textbook > Exploratory Data Analysis
Measure of Variability
5 Activities
The data set is 20, 20, 30, 40, 40. Which of the following is true?
Check all that applies:
The standard deviation must be positive.
The standard deviation is 10.
If the last number "40" is changed to "50" (as such: 20, 20, 30, 40, 50), the standard deviation will increase.
If "30" is added to the data set (as such: 20, 20, 30, 30, 40, 40), the standard deviation will remain unchanged.
I don't know
Check Submission
More Measure of Variability Questions:
Statistics: Data transformation
You multiply all values in a data set by
5
5
5
and then add four. The resulting mean is 34 and the resulting standard deviation is 25.
Determine the mean and standard deviation of the original data.
Measure of Variability
Which of the following data sets has the largest variance?
Measures of variability
Which of the following is the standard deviation of the data set
7
,
9
,
−
2
,
3
7,9,-2,3
7
,
9
,
−
2
,
3
Measure of Central Tendency: Transforming Data
You multiply all values in a data set by
5
5
5
and then add four. The resulting mean is 34 and the resulting standard deviation is 25.
Determine the mean and standard deviation of the original data.
Transforming Data: Central tendency and variability
Practice: Transforming Data
You multiply all values in a data set by
5
5
5
and then add four. The resulting mean is 34 and the resulting standard deviation is 25.
Determine the mean and standard deviation of the original data.
Measures of Variability
Calculate the interquartile range for the data set: 9, 10, 11, 14, 14, 16, 20, 30, 32, 34, 38.
Variance
Which of the following data sets has the largest standard deviation?
Measure of Variability
A bag has three red and four black balls. One ball is drawn at a time, without replacement until a black ball is drawn. Let X represent the number of balls drawn until you get a black one.
Find the standard deviation of X. Enter answer in one decimal place X.X (e.g. 2.5)
Measure of Variability
a) Find the variance and standard deviation: 7 21 28 40
b) Which of the following has a smaller variance?
a) 2, 6, 10