Answer: Reality TV and cosmetic surgery. Refer to the

Chapter 12, Problem 116E

(choose chapter or problem)

QUESTION:

Reality TV and cosmetic surgery. Refer to the BodyImage: An International Journal of Research (March2010) study of the influence of reality TV shows on one's desire to undergo cosmetic surgery, Exercise 12.17 (p. 682).Recall that psychologists modeled desire to have cosmetic surgery (y) as a function of gender (\(x_1\)), self-esteem (\(x_2\)), body satisfaction (\(x_3\)), and impression of reality TV (\(x_4\)). Suppose you want to determine which subset of these four independent variables is best for predicting one's desire to have cosmetic surgery. Consequently, you will run a stepwise regression.

a. In step 1 of the stepwise regression, how many t-tests will be performed?

b. In step 2 of the stepwise regression, how many t-tests will be performed?

c. Access the data saved in the file and run the stepwise regression. Which independent variables comprise the best subset of variables for predicting one’s desire to have cosmetic surgery?

d. Do you recommend using the resulting stepwise regression model for predicting one’s desire to have cosmetic surgery or do you recommend further analysis? Explain your reasoning.

Questions & Answers

QUESTION:

a. In step 1 of the stepwise regression, how many t-tests will be performed?

b. In step 2 of the stepwise regression, how many t-tests will be performed?

c. Access the data saved in the file and run the stepwise regression. Which independent variables comprise the best subset of variables for predicting one’s desire to have cosmetic surgery?

d. Do you recommend using the resulting stepwise regression model for predicting one’s desire to have cosmetic surgery or do you recommend further analysis? Explain your reasoning.

ANSWER:

Step 1 of 5

(a)

The variables involved in the given model are gender , self-esteem , body satisfaction , and impression of reality TV . Since there are 4 one-variable models to the fit, the number of t-tests performed in step 1 of the stepwise regression is 4.