Police trainees are given a test to assess how good their memory is, After seeing ten car plates for 15 seconds each, they must write down as many as they can remember. The trainees then attend a memory improvement course. After this week-long course, they are retested. The results of the tests for eight police trainees are presented in the following table.

Test, at the 5% significance level, whether the course has made a difference to the trainees' scores, assuming the differences in scores are normally distributed.

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Number correct 5 6. 7. 6. before course Number correct 6 7 8. after course st in