Are you smarter than a second-grader?A random sample of59second-graders in a certain school district are given a standardized mathematics skills test. The sample mean score is= x 50.Assume the standard deviation of test scores is= 14.The nationwide average score on this test is48

.The school superintendent wants to know whether the second-graders in her school district have greater math skills than the nationwide average. Use the= 0.10level of significance and the critical value method.

(a) State the appropriate null and alternate hypotheses.

:

H

0

:

H

1

This hypothesis test is a