An operational requirement stated that a Marine Howitzer must be able to be positioned and set up ready for fire by the crewin 6.5 minutes or less.Four tests were run resulting in the following data:4.9 min,7.1 min,5.3 min, and 6.1 min.

a. Assuming an unknown population variance, what was the resulting confidence that the requirement had been met?(t-table last page)

b. Given the mean and standard deviation remain the same, what is the estimated number of trials required to achieve a 95% Confidence Level?