How much influence does the media, especially reality television programs, have on one's decision to undergo cosmetic surgery? This was the question of interest to psychologists who published an article in Body Image: An International Journal of Research (March 2010). In the study, 170 college students answered questions about their impressions of reality TV shows featuring cosmetic surgery, level of self-esteem, satisfaction with one's own body, and desire to have cosmetic surgery to alter one's body. The variables analyzed in the study were measured as follows: DESIRE-scale ranging from 5 to 25, where the higher the value, the greater the interest in having cosmetic surgery; GENDER-1 if male, 0 if female; SELFESTM-scale ranging from 4 to 40, where the higher the value, the greater the level of self-esteem; BODYSAT-scale ranging from 1 to 9, where the higher the value, the greater the satisfaction with one's own body; and IMPREAL-scale ranging from 1 to 7, where the higher the value, the more one believes reality television shows featuring cosmetic surgery are realistic. The data for the study (simulated based on statistics reported in the journal article) are saved in the file. Selected observations are listed in the table shown below. The psychologists used multiple regression to model desire to have cosmetic surgery (y) as a function of gender (x1), self-esteem (x2), body satisfaction (x3), and impression of reality TV (x4).
a. Fit the first-order model, E(y) = y = β0 + β1x1 + β2x2 + β3x3 + β4x4, to the data in the file. Give the least squares prediction equation.
b. Interpret the β estimates in the words of the problem.
c. Is the overall model statistically useful for predicting desire to have cosmetic surgery? Test using α = .01.
d. Which statistic, R2 or R2a is the preferred measure of model fit? Practically interpret the value of this statistic.
e. Conduct a test to determine whether desire to have cosmetic surgery decreases linearly as level of body satisfaction increases. Use α = .05.
f. Find a 95% confidence interval for β4. Practically interpret the result.

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STUDENT DESIRE GENDER SELFESTM BODYSAT IMPREAL 24 20 25 2 13 18 166 18 0 25 167 168 169 170 13 26 13 20 27