Assume that Friday morning taxi-cab rides have times with a standard deviation of

=9.7

minutes. A cab driver records times of rides during a Friday afternoon time period and obtains these statistics:

n=11,

x=20.6

minutes,

s=11.9

minutes. Use a

0.05

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.