Deck 14: Standard Deviation

Question 1

standard deviation is the most frequently used measure of variability. ________

Answer 1

True

Question 2

Among the following, which word(s) does NOT associate with variability?

A) Spread and dispersion
B) Mean
C) Standard deviation
D) Interquartile Range

Answer 2

B

Question 3

Assuming all three groups of data have the same mean of 7 (M = 7), which group shows the highest variability? List them in the order of the highest variability to the lowest variability.
a. Group

Answer 3

a: S = 5.42
b. Group D: S = 1.34
c. Group B: S = 5.01
d. Group C: S = 0.00

Question 4

What is the 68% range of the following data?
M = 6, S = 2.5

Question 5

What is NOT true about the above range?

A) The 68% of the data lie within this range
B) About two-thirds of the cases lie within 2.5 points of the mean
C) Based on the mean and standard deviation the data shows a skewed distribution
D) The 68% of the cases lie in the middle area bounded by one standard deviation on each side
E) About two-thirds of the cases lie between scores of 3.5 and 8.5

Question 6

When reporting results, which of the following is NOT true?

A) Report Mean and standard deviation together
B) Report Median and interquartile range together
C) Report Mean and interquartile range together
D) Report Mean and the 68% range together