1. A survey of 800 women shoppers found that 17% of them shop onimpulse. What is

Question

1.

A survey of 800 women shoppers found that 17% of them shop onimpulse. What is the 98% confidence interval for the trueproportion of women shoppers who shop on impulse?

A)     B)     C)     D)

2.

A sample of 25 different payroll departments found that theemployees worked an average of 310.3 days a year with a standarddeviation of 23.8 days. What is the 90% confidence intervalfor the average days worked, , of all payroll departments?

A)

C)

B)

D)

3.

What is the 90% confidence interval for the variance of examscores for 28 algebra students, if the standard deviation of theirlast exam was 12.7?

A)

C)

B)

D)

1.

A survey of 800 women shoppers found that 17% of them shop onimpulse. What is the 98% confidence interval for the trueproportion of women shoppers who shop on impulse?

A)     B)     C)     D)

Explanation / Answer

1. (.1391,.2009) (use a 1-proportion z interval) 2. (302.16,318.44) (use a t interval) 3. sorry, but i cant remember how to do this one

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