1. Paul uses the stratified random sampling technique of categorization for his research project. He first divides the country into 15 regions; then for each region, he categorizes the population into three age groups; young, adults, and elderly. Finally, he divides these categories into males and females. The number of cells or strata the sampling plan entails is closest to:

A.    20.
B.    45.
C.    90.


2. A researcher is unsure of the underlying population distribution and wants to increase the reliability of the parameter estimates. Which of the following is least likely to achieve her objective?

A. Increase in the sample size.

B. Use of point estimates rather than confidence intervals.

C. Use of the t-distribution rather than the normal distribution to establish confidence intervals.


3. Which of the following would result in the t-distribution to approach a standard normal distribution?

A. Increase in degrees of freedom

B. Increase in standard deviation

C. Greater probability in the tails.


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