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