# Question: The mean and the standard deviation of the sample of

The mean and the standard deviation of the sample of 65 customer satisfaction ratings are

=5.46 and s= 2.475

a. What does the histogram in Figure 2.16 say about whether the Empirical Rule should be used to describe the bank customer waiting times?

b. Use the Empirical Rule to calculate estimates of tolerance intervals containing 68.26 percent, 95.44 percent, and 99.73 percent of all possible bank customer waiting times.

c. Does the estimate of a tolerance interval containing 68.26 percent of all waiting times provide evidence that at least two- thirds of all customers will have to wait less than eight minutes for service? Explain your answer.

=5.46 and s= 2.475

a. What does the histogram in Figure 2.16 say about whether the Empirical Rule should be used to describe the bank customer waiting times?

b. Use the Empirical Rule to calculate estimates of tolerance intervals containing 68.26 percent, 95.44 percent, and 99.73 percent of all possible bank customer waiting times.

c. Does the estimate of a tolerance interval containing 68.26 percent of all waiting times provide evidence that at least two- thirds of all customers will have to wait less than eight minutes for service? Explain your answer.

## Relevant Questions

Consider the 63 automatic teller machine (ATM) transaction times given in Table 3.4 above. a. Construct a histogram (or a stem- and- leaf display) for the 63 ATM transaction times. Describe the shape of the distribution of ...Recall from page 121 that 20 randomly selected customers give the following satisfaction ratings ( on a scale of 1 to 10) for a DVD recorder: 1, 3, 5, 5, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10, 10. a. Using the ...Accu-Copiers, Inc., sells and services the Accu-500 copying machine. As part of its standard service contract, the company agrees to perform routine service on this copier. To obtain information about the time it takes to ...Suppose that a company’s sales were $ 5,000,000 three years ago. Since that time sales have grown at annual rates of 10 percent, 10 percent, and 25 percent. a. Find the geometric mean growth rate of sales over this three- ...Consider the trash bag problem. Suppose that an independent laboratory has tested 30- gallon trash bags and has found that none of the 30- gallon bags currently on the market has a mean breaking strength of 50 pounds or ...Post your question