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=11,

x=21.2

minutes,

s=13.7

minutes. Use a

0.10

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 hypotheses. Identify the test statistic.

Identify the P-value.