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"For Steve Only" 11.9 A...

"For Steve Only"

11.9 A hospital conducted a study of the waiting time in its emergency room. The hospital has a main campus and three satellite locations. Management had a business objective of reducing waiting time for emergency room cases that did not require immediate attention. To study this, a random sample of 15 emergency rooms cases that did not require immediate attention at each location were selected on a particular day, and the waiting time (measured from check-in to when the patient was called into the clinic area) was measured. The results are stored in ERWaiting.

http://www.mediafire.com/view/u69twz6wc29dbmc/ERWaiting.xls

a. At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations?

b. If appropriate, determine which locations differ in mean waiting time.

c. At the 0.05 level of significance, is there evidence of a difference in the variation in waiting time among the floor locations?

13.7 A critically important asset of customer service in a supermarket is the waiting time at the checkout (defined as the time the customer enters the line until he or she is served) Data were collected during time periods in which a constant number of checkout counters were open. The total number of customers in the store and the waiting times (in minutes) were recorded. The results are stored in Supermarket.

http://www.mediafire.com/view/7ja4m77h3fq6qmm/Supermarket_(1).xls

a. Construct a scatter plot.

b. Assuming a linear relationship, use the least-squares method to determine he regression coefficients b0 and b1.

c. Interpret the meaning of B0 and b1 in this problem.

d. Predict the monthly rent for an apartment that has 1,000 square feet.

e. Why would it not be appropriate to use the model to predict the monthly rent for apartments that have 500 square feet?

f. Your friends Jim and Jennifer are considering signing a lease for an apartment in this residential neighborhood. They are trying to decide between two apartments, one with 1,000 square feet for a monthly rent of $1,275 and the other with 1,200 square feet for a monthly rent of $1,425. Based on (a) through (d), which apartment do you think is a better deal?

11.9 A hospital conducted a study of the waiting time in its emergency room. The hospital has a main campus and three satellite locations. Management had a business objective of reducing waiting time for emergency room cases that did not require immediate attention. To study this, a random sample of 15 emergency rooms cases that did not require immediate attention at each location were selected on a particular day, and the waiting time (measured from check-in to when the patient was called into the clinic area) was measured. The results are stored in ERWaiting.

http://www.mediafire.com/view/u69twz6wc29dbmc/ERWaiting.xls

a. At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations?

b. If appropriate, determine which locations differ in mean waiting time.

c. At the 0.05 level of significance, is there evidence of a difference in the variation in waiting time among the floor locations?

13.7 A critically important asset of customer service in a supermarket is the waiting time at the checkout (defined as the time the customer enters the line until he or she is served) Data were collected during time periods in which a constant number of checkout counters were open. The total number of customers in the store and the waiting times (in minutes) were recorded. The results are stored in Supermarket.

http://www.mediafire.com/view/7ja4m77h3fq6qmm/Supermarket_(1).xls

a. Construct a scatter plot.

b. Assuming a linear relationship, use the least-squares method to determine he regression coefficients b0 and b1.

c. Interpret the meaning of B0 and b1 in this problem.

d. Predict the monthly rent for an apartment that has 1,000 square feet.

e. Why would it not be appropriate to use the model to predict the monthly rent for apartments that have 500 square feet?

f. Your friends Jim and Jennifer are considering signing a lease for an apartment in this residential neighborhood. They are trying to decide between two apartments, one with 1,000 square feet for a monthly rent of $1,275 and the other with 1,200 square feet for a monthly rent of $1,425. Based on (a) through (d), which apartment do you think is a better deal?

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