ü How much variability is occurring in our delivery times? What range of delivery times would you expect to capture 95% of our delivery times?
Added by James M.
Step 1
.., xn and note the sample size n (number of deliveries). Decide whether you treat this as a sample from a larger process (use sample formulas) or the entire population (use population formulas). Show more…
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In cell B3, find the average delivery time for the sample of shipments from the Data sheet. 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 appropriate probability table to use? 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 In cell B12, find the width of the confidence interval at the 90% confidence level. In cell B13, find the score from the appropriate probability table to construct a 99% confidence interval. In cell B14, find the margin of error at the 99% confidence level. In cell B15, find the upper limit for the mean at the 99% confidence level. In cell B16, find the lower limit for the mean at the 99% confidence level. In cell B17, find the width of the confidence interval at the 99% confidence level. By comparing the width of the confidence interval (CI) at 90% and 99%, what can we conclude about the width of the CI? Based on the upper and lower limit values for a 90% confidence level, should the quality assurance team consider recommending that the company should change their promise to customers that they deliver international shipments within 7 days? Based on the upper and lower limit values for a 99% confidence level, should the quality assurance team consider recommending that the company should change their promise to customers that they deliver international shipments within 7 days? What options does the quality assurance team have to reduce their margin of error for the 99% confidence interval?
Ameer S.
A company tracks daily deliveries. The standard deviation of delivery times is 2.5 hours. What does this indicate about the delivery time consistency?
Lucas F.
Given a mean delivery time of 4 and a standard deviation 2.5, what is the probably that the delivery will occur between 3 and 5 days?
Pritesh R.
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