11.In a population of normally distributed aptitude scores of 1000 academy students with mean 70 and

Standard deviation 10, how many score above 95?

a. 494b. 6c. 25d. 250e. not given

12.The z-score for x-bar = 2.7, mu = 3, s = 0.1,and n = 100 is:

a. -30b. -3c. -0.3d. 3e. not given

13.Find a 95% confidence interval for mu if s = 5.26, x-bar = 70.1, and n = 49.

a. 70.1+/-0.2104b. 70.1+/-1.2361c. 70.1+/-1.4728d. 70.1+/-1.6772e. not given

14.Compute a 99% confidence interval for mu if x-bar = 16.3, s = 1.5, and n = 25.

a. 16.3+/-0.8391b. 16.3+/-0.774c. 16.3+/-0.8361d. 16.3+/-0.16782e. not given

15.Assume Ho: mu

a. 1.414b. 0.483c. 0.017d. 2.12e. not given

16.A company claims a mean battery life of 42 months.A sample of 36 yields a mean of 39 months

with a standard deviation of 7 months.Test the null hypothesis, Ho: mu >/=42 with alpha 0.05.

a. Fail to reject Hob. Reject Hoc. Fail to reject Had. Reject

i said

B

C

A

D

D

A