Question

A hospital is trying to cut down on emergency room wait times. It is interested in the amount of time patients must wait before being called back to be examined. An investigation committee randomly surveyed 70 patients. The sample mean was 1.5 hours with a sample standard deviation of 0.5 hours.

A) Identify the following. (Enter exact numbers as integers, fractions, or decimals.)

1)    x-bar =

2)  s_{x =}

3) n =

4) n-1 =

B)

Which distribution should you use for this problem? (Enter your answer in the form z or t_df where df is the degrees of freedom.)

Answer 1

A)

1)    x-bar = 1.5 hours

2)  sx = 0.5 hours

3) n = 70

4) n-1 = 69

B) Since the size of the sample(n) is greater than 30, so normal distribution can be used in this problem.