Which of the following examples involves paired data?
a. A psychologist compares two methods of memorizing information. Twenty people use one method and twenty other people use the second method.
b. A researcher estimates the difference between the mean forearm lengths of men and women based on a random sample of each.
c. A medical researcher measures the cholesterol levels of each of 30 heart attack patients 2 days after the attack and again 4 days after the attack.
d. A marketing research expert estimates the proportion of the 22 to 29 year-old age group that says they might buy a new car in the next two years
Question 2
In each situation, indicate whether it would make more sense to find a confidence interval for the population parameter or to conduct a hypothesis test for a specific null value. The school board wishes to find out if the newly adapted teaching method for K-5 math has resulted in higher average grades.
a. Confidence interval
b. Hypothesis test
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