17. You want to test a new athlete\'s-foot treatment. You test men and women sep

Question

17. You want to test a new athlete's-foot treatment. You test men and women separately, randomly dividing them into treatment and control groups. The treatment groups receive the new treatment and the control groups receive an inert powder that resembles the treatment. Neither the subjects nor the test administrators know which groups receive the treatment and which groups receive the inert powder. At the end of the experiment, all subjects are asked to rate their degree of relief from athlete's foot. These scores are compared between groups. Which of the following groups of elements were present in this study?

A. Randomization, blocking, placebo, comparative, double-blind

B. Comparative, randomization, placebo, blind

C. Double-blind, randomization, comparative, placebo

D. Randomization, stratified sample, placebo, blind, treatment

E. Double-blind, control, observational, blocking

18. Which of these statements are true if you need to make an inference about the mean of a population?

I. You must use a t test rather than a z-test unless you know the population standard deviation.

II. If you do not know the population standard deviation, your sample must be a simple random sample from a normal population.

III. Sample sizes must be at least 30.

A. I only

B. II only

C. III only

D. I and II only

E. I, II, and III

Explanation / Answer

17)

Answer is A

Subjects are assigned to blocks, based on gender. Then, within each block, subjects are randomly assigned to treatments and control group.This is called blocking.

Control group is receiving a placebo (used as a contol in testing the druf)

Only option witht placebo and blocking is option A

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