A Sample of 125 Tobacco Smokers Who Recently Completed a New

Multiple Choice

A sample of 125 tobacco smokers who recently completed a new smoking-cessation program were asked to rate the effectiveness of the program on a scale of 1 to 10, with
10 corresponding to "completely effective" and 1 corresponding to "completely
Ineffective". The average rating was 4.1 and the standard deviation was 4.0.
Construct a 95% confidence interval for the mean score.

A) $3.8 < \mu < 4.4$
B) $0 < \mu < 4.1$
C) $3.4 < \mu < 4.8$
D) $3.7 < \mu < 4.5$