In cell B4, find the standard deviation of the delivery times for the sample of shipments from the Data sheet. In cell B5, find the size of the sample of shipments from the Data sheet. To build the confidence interval for the mean of the delivery times from the Data Sheet, what is the appropriat In cell B7, find the score from the appropriate probability table to construct a 90% confidence interval. In cell B8, find the margin of error at the 90% confidence level. In cell B9, find the upper limit for the mean at the 90% confidence level. In cell B10, find the lower limit for the mean at the 90% confidence level. . Based on the numbers in cell B9 and B10, we can be 90% confident that