Exam 4: Measures of Variability

Calculate the value of the appropriate measure of variability for each racial group.

The sum of the deviations of scores from the mean is always positive.

Calculate and provide a substantive interpretation of the value of the IQV.

Which measure of variability is used for nominal variables such as race and ethnicity?

What are the relative strengths and weaknesses of using standard deviation as a measure of variability?

What is the most basic consideration in choosing a measure of variability?

Calculate the value of the standard deviation for the following sub-sample: 2,7,4,4,1,2,2,3,1,2,4,5

Which measure of variability is used for interval-ratio variables and is the square root of the average of the squared deviations from the mean?

Calculate the value of the interquartile range for the following sub-sample: 24,27,35,31,21,22,28,18,25,24,36,20.

What are the relative strengths and weaknesses of using range as a measure of variability?

Calculate the range for the following sub-sample: 2,7,4,4,1,2,2,3,1,2,4,5.

Calculate the value of the interquartile range for the following sub-sample: 2,7,4,4,1,2,2,3,1,2,4,5.

Calculate the values of the mean for the following sub-sample: 2,7,4,4,1,2,2,3,1,2,4,5.

Calculate the value of variance for the following sub-sample: 24,27,35,31,21,22,28,18,25,24,36,20.

Consider the following hypothetical scores: 21,25,37,38,39,42,44,45.What is the value of the interquartile range?

A graphic device that is able to simultaneously present the range,the interquartile range,the median,and the minimum and maximum scores is referred to as a

The width of the middle 50% of a distribution,defined as the difference between the third and first quartiles,is referred to as the

The range is based on only one score.

SELECT ALL THAT APPLY. -The formula for calculating interquartile range is

SELECT ALL THAT APPLY. -The box plot can visually present