Chapter 8.3, Problem 132E

Preliminary data analyses indicate that you can reasonably apply the t-interval procedure (Procedure 8.2 on page 355) in Exercises 8.129–8.134.

8.132 Family Fun? Taking the family to an amusement park has become increasingly costly according to the industry publication Amusement Business, which provides figures on the cost for a family of four to spend the day at one of America’s amusement parks. A random sample of 25 families of four that attended amusement parks yielded the following costs, rounded to the nearest dollar.

Obtain and interpret a 95% confidence interval for the mean cost of a family of four to spend the day at an American amusement park.

(Note: $\bar{x}$ = $193.32; s = $26.73.)