A random sample of 12 colleges was taken. The mean rate of graduation within four years was 42.8% with a margin of error of 6.0%. The distribution of graduation rates is Normal. Complete parts (a) and (b) below.

 

 

a. Choose the correct interpretation of the confidence interval below and fill in the answer boxes to complete your choice. (Type integers or decimals rounded to the nearest tenth as needed. Use ascending order.) O A. We are 95% confident that the population mean is between % and%. B. We are 95% confident that the recorded sample mean is between % and %. C. There is a 95% probability that the population mean is between % and %.