Even within a particular chain of hotels, lodging during the summer months can vary substantially depending on the type of room and the amenities offered. Suppose that we randomly select 50 billing statements from each of the computer databases of the Marriott, Westin, and the Doubletree hotel chains, and record the nightly room rates.

a. Describe the sampled population(s).
b. Find a point estimate for the average room rate for the Marriott hotel chain. Calculate the margin of error.
c. Find a point estimate for the average room rate for the Westin hotel chain. Calculate the margin of error.
d. Find a point estimate for the average room rate for the Doubletree hotel chain. Calculate the margin of error.
e. Display the results of parts b, c, and d graphically, using the form shown in Figure 8.5. Use this display to compare the average room rates for the three hotel chains.

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Marriott Westin Doubletree Sample Average (S) Sample Standard Deviation 7.2 150 165 125 22.5 12.8