Question: To test a theory that alcohol consumption can have an effect on test scores, a researcher conducts a study 10 adults.  Each is given a test.  Then for one week, each subject is required to consume a certain amount of alcohol; then he or she is retested.  The results are show here. Significance level=0.1, test the claim that alcohol does not affect a person’s test score

Subject            Score before                Score after

1                      105                              106

2                      109                              105

3                      98                                94

4                      112                              109

5                      109                              105

6                      117                              115

7                      123                              125

8                      114                              114

9                      95                                98

10                    101                              100

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