14 Dating and disclosure. The Journal of Adolescence (April 2010) conducted a study of adolescents’ disclosure of their dating and romantic relationships. Data collected for a sample of 222 high school students were used to determine the level of disclosure of the date’s identity to an adolescent’s mother (measured on a 5-point scale, where 1 = ;never tell,< 2 = ;rarely tell,< 3 = ;sometimes tel,<

4 = ;almost always tell,< and 5 =

a. Give the equation of a first-order model for y as a function of the four independent variables.

b. The coefficient of determination for the model, part a , was reported as R2 = .24 . Give a practical interpretation of this value.

c. Give the null hypothesis for testing the overall adequacy of the model, part a .

d. The test, part c , resulted in F = 56.60 with p@value 6 .001 . Interpret this result using a = .05 .

e. The estimate of the beta coefficient for age ( x 2 ) was reported as -.09 . Give a practical interpretation of this value.