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. A weight-loss clinic wishes to determine how much more weight patients lose when they add both diet and exercise to their daily routines compared to when they just diet.
a. Confidence interval
b. Hypothesis test
Q. 2The multiplier for a confidence interval for one mean or the mean of paired differences depends on
a. The confidence level only.
b. The degrees of freedom only.
c. The confidence level and the degrees of freedom.
d. The confidence level and the sample standard deviation.
Q. 3In 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. A weight-loss clinic wishes to determine if a certain popular diet actually results in weight-loss.
a. Confidence interval
b. Hypothesis test
Q. 4Which one of the following ways of collecting data would not result in paired data?
a. Each person is measured twice.
b. Similar individuals are paired prior to an experiment. Each individual in a pair receives a different treatment.
c. Two different variables are measured for each person.
d. Two independent samples are selected and the same response variable is compared between samples.
Q. 5In 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. A consumer agency wishes to find out how much more private hospitals and medical clinics charge for certain procedures than the large (research) hospitals.
a. Confidence interval
b. Hypothesis test
Q. 6Which 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
Q. 7In 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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