To test the hypothesis that eating fish makes one smarter, a random sample of 12 persons take a fish oil supplement for one year and then are given an IQ test. Here are the results: 116 111 101 120 99...

To test the hypothesis that eating fish makes one smarter, a random sample of 12

persons take a fish oil supplement for one year and then are given an IQ test. Here are the results:

116        111        101        120        99           94           106        115        107        101        110        92

Compute the P-value and make decision using 95% confidence level. Your decision is?