22,205 PM
Test4
Assume that Friday morning taxi-cab rides have times with a standard deviation of a 9.6 minutes. A cab driver records times of rides
during a Friday afternoon time period and obtains these statistics: n-15, x 20.3 minutes, s 12.6 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.