Mathematics, 23.05.2020 00:06 cocoapop

In a random sample of 40 people who rode a roller coaster one day, the mean wait time is 52.4 minutes with a standard deviation of 9.5 minutes. In a random sample of 50 people who rode a Ferris wheel the same day, the mean wait time is 14.1 minutes with a standard deviation of 2.3 minutes.

Which interval is the 99% confidence interval for the difference between the mean wait times of everyone who rode both rides?

A: (34.3, 42.3)
B: (36.9, 40.7)
C: (36.8, 39.8)
D: (35.8, 40.8)

Answers: 3

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In a random sample of 40 people who rode a roller coaster one day, the mean wait time is 52.4 minute...