11.75 Suspecting that television repair shops tend to charge women more than they do men, Emily disconnected the speaker wire on her portable television and took it to a sample of 12 shops. She was given repair estimates that averaged $85, with a standard deviation of

$28. Her friend John, taking the same set to another sample of 9 shops, was provided with an average estimate of

$65, with a standard deviation of $21. Assuming normal populations with equal standard deviations, use the 0.05 level in evaluating Emily’s suspicion. Using the appropriate statistical table, what is the approximate p-value for this test?