A recent survey indicated that the average amount spent for breakfast by business managers was $7.58,
with a standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher than $7.58. A
sample of 81 business managers on the West Coast had an average breakfast cost of $7.65.
-Give the p-value for the data provided above.
A) 0.4987
B) 0.0084
C) 0.1325
D) 0.0668

Question

Quizplus · Accepted Answer

The p-value is calculated using a one-sample z-test. The z-score is (7.65 - 7.58) / (0.42/√81) = 1.607. The p-value for a one-tailed test with z = 1.607 is approximately 0.0668.

A Recent Survey Indicated That the Average Amount Spent for Breakfast