Question

1) Use the given degree of confidence and the sample data to construct a confidence interval for the proportion of population p.

Of 276 randomly selected employees of a company, 10.87% of them travel by carpooling. Build a 90% confidence interval for the actual percentage of all company employees who share the trip.

Select one:

A. 6.04% <p <15.7%

B. 7.79% <p <14.0%

C. 6.50% <p <15.2%

D. 7.20% <p <14.5%

2) True or False: If we are interested in estimating the population mean based on a sample from a population for which we know neither the mean nor the standard deviation, the critical value will be a t value from the t-distribution.

Answer 1