Author Question: In order to estimate the average time spent on the computer terminals per student at a local ... (Read 94 times)

RODY.ELKHALIL · **on:** Jun 24, 2018

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours. If the sample mean is 9 hours, then the 95 confidence interval is approximately _____.
a. 7.04 to 110.96 hours
b. 7.36 to 10.64 hours
c. 7.80 to 10.20 hours
d. 8.74 to 9.26 hours

Question 2

The weight of football players is normally distributed with a mean of 200 pounds and a standard deviation of 25 pounds. What percent of players weigh between 180 and 220 pounds?
a. 34.13
b. 68.26
c. 0.3413
d. None of the answers is correct.