leriahLv1

1 May 2023

Assume that Friday morning taxi-cab rides have times with a standard deviation of =9.8 minutes. A cab driver records times of rides during a Friday afternoon time period and obtains these statistics n = 12, = 21.5 minutes, s = 13.3 minutes. Use a 0.01 significance level to test the claim that these Friday afternoon times have greater variation than the Friday morning times. Assume that the sample is a simple random sample selected from a normally distributed population.

Let denote the population standard deviation of Friday afternoon cab-ride times. Identify the null and alternative hypothesis:

: ____

: ____

(Type integers of decimals. Do not round.)