1. A random sample of 50 female college students shows that average weight is 121 lb. with a Ssandard deviation of 15 lb.
2. At 5% level of significance, does the sample provide enough evidence to prove that the mean weight of all college students is more than 115 lb.?

1. Also explain the meaning of alpha and P-value occurred in the content of this problem.

1. Describe what kind of error it is for type II error in the content of this problem.