5.21 Last year the elapsed time of long-distance telephone calls for a national retailer was skewed to the right with a median of 3 minutes 15 seconds.

The recession has reduced sales, but the company’s treasurer claims that the median length of long-distance calls now is even greater than last year. A random sample of 5625 calls is selected from recent records and 2890 of them are found to last more than 3 minutes 15 seconds. Is the treasurer’s claim supported? Give the null and alternative hypotheses and the P value.