Question

In order to understand the relation between smoking and cardiovascular disease (CVD), a team of researchers designed two studies: Study I looks at the numbers of cigarettes smoked per day by CVD patients and by individuals without CVD; Study II looks at the numbers of smokers and nonsmokers in CVD-patients group and in the group of individuals without CVD. Which one of the following statements is correct?

A. An independent-samples t test should be run for Study I, because the outcome—cigarettes smoked per day—is a continuous variable, and the grouping variable—CVD patients vs. those without CVD—categorizes the sample into two independent groups.

B. An independent-samples t test should be run for Study I, and an ANOVA should be run for Study II.

C. A chi-square test of independence should be run for Study II, because the outcome—smoker vs. nonsmoker—is a continuous variable, and the grouping variable—CVD patients vs. those without CVD—categorizes the sample into two independent groups.

D. A chi-square goodness-of-fit test should be run for Study II, because the outcome—smoker vs. nonsmoker—is a dichotomous variable, and the grouping variable—CVD patients vs. those without CVD—categorizes the sample into two independent groups.

Answer 1

solution :

given statement

In order to understand the relation between smoking and cardiovascular disease (CVD), a team of researchers designed two studies: Study I looks at the numbers of cigarettes smoked per day by CVD patients and by individuals without CVD; Study II looks at the numbers of smokers and nonsmokers in CVD-patients group and in the group of individuals without CVD.

the following statement is correct regarding the aboe given statement

A chi-square test of independence should be run for Study II, because the outcome—smoker vs. nonsmoker—is a continuous variable, and the grouping variable—CVD patients vs. those without CVD—categorizes the sample into two independent groups.

option c