Hotel A
Hotel B
Hotel c
sample average ($)
150
175
105
sample standard deviation
17.7
22.5
12.6
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 Hotel
A, the Hotel B, and the Hotel C chains, and record the nightly room
rates. The means and standard deviations for 50 billing statements
from each of the computer databases of each of the three hotel
chains are given in the table.
A. Find a 95% confidence interval for the difference in the
average room rates for the Hotel A and the Hotel C chains. (Round
your answers to two decimal places.)
B. Find a 99% confidence interval for the difference in the
average room rates for the Hotel B and the Hotel C chains. (Round
your answers to two decimal places.)