A hypothesis test with a statistically significant result indicates that the alternative hypothesis is correct. (True/False)

Which two of the following statements are incorrect?

A. A statistically significant result is always practically significant.

B. A result that is not statistically significant is never of practical significance.

C. It is possible that a statistically significant result is not of practical significance.

D. It is possible that a result that is not statistically significant is of practical significance.

Large payments to subjects for taking part in an experiment are unethical primarily because:

A. It is a form of coercion that reduces the freedom of choice about taking part.

B. It may cause the subject to give fake results so they can participate in other experiments

C. If this was a precedent, it would make experiments too expensive

In testing whether a new cold remedy reduces the average length of time that a subjects cold would last, a researcher plans an experiment with 25 subjects getting the new remedy and 25 getting a placebo. Which of the following statements is true?

A. It is more likely that the researcher can get a small p-value if she used fewer subjects.

B. it is more likely that the researcher can get a small p-value if she used more subjects.

C. It is more likely that the researcher can get a larger p-value by using a within subject design with less variability.