1. When a variable follows a normal distribution, what percent of observations are contained within 2.5 standard deviations ON EITHER SIDE of the mean? (you may use R)

A. 68%

B. 85.68%

C. 98.76%

D. 99.38%

E. 99.99%

2 ______________ statistical tools requires that certain conditions to be passed, in order to feel confident that the sample looks enough like the population that the findings can be generalized to the larger population.

A. Descriptive

B. Inferential

C. Both descriptive and inferential

D. Neither descriptive nor inferential

3 When is MODE most useful as a meaure of dispersion?

A. Cateogorical data

B. Numerical data

C. Both, equally

D. Mode is not a measure of dispersion