126 Scary-movie study. According to a University of Michigan study, many adults have experienced lingering “fright”

effects from a scary movie or TV show they saw as a teenager ( Tampa Tribune , March 10, 1999). In a survey of 150 college students, 39 said they still experience “residual anxiety” from a scary TV show or movie.

a. Give a point estimate pn for the true proportion of college students who experience “residual anxiety” from a scary TV show or movie.

b. Find a 95% confidence interval for p .

c. Interpret the interval you found in part b .