Question

The budget director for a company is interested in comparing the daily travel expenses for the sales staff and the audit staff.  The results of her study are presented below.

 

Step 1 of 3: 

Construct the 90% confidence interval for the true difference (Sales - Audit) in the means.

A) 22.39 to 37.57 

B) 22.40 to 37.58 

C) 22.41 to 37.59 

D) 23.63 to 36.37

Step 2 of 3: 

Construct the 95% confidence interval for the true difference (Sales - Audit) in the means.

A)  (22.40, 37.58)

B) (22.38, 37.56)

C) (22.41, 37.59) 

D) (22.39, 37.57)

 

Step 3 of 3: Construct the 99% confidence interval for the true difference (Sales - Audit) in the means.

A) (20.04, 40.00)

B) (20.02, 39.98)

C) (20.03, 39.99)

D) (22.01, 39.97)

Sample Standard
Deviation of Daily
Travel Expenses
Mean Daily
Travel Expenses
Staff
Sample Size
$160
$20
Sales
40
Audit
130
15
45
Expand
Transcribed Image Text

Sample Standard Deviation of Daily Travel Expenses Mean Daily Travel Expenses Staff Sample Size $160 $20 Sales 40 Audit 130 15 45

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