CNN reported the results of a survey of 902 adult Americans taken to assess whether Americans think there should be stronger gun control laws. The margin of error was reported to be 3. Which choice best describes how to interpret the 3 margin of error?
a. The sample and population percentages differ by less than 3.
b. The sample and population percentages differ by more than 3.
c. There is a 95 chance that the sample and population percentages differ by more than 3
d. There is a 95 chance that the sample and population percentages differ by less than 3.
Question 2
A researcher compares two different treatments for depression. The result is not statistically significant so the researcher says that the two treatments are equally effective. Which one of the following statements is correct?
a. The researcher should have instead concluded that there is not sufficient evidence to conclude that the two treatments are different.
b. The researcher should have instead concluded that there is not sufficient evidence to conclude that the two treatments are equally effective.
c. A Type I error may have been made.
d. A Type I error was definitely made.
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