The John Fisher School

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(a)    The psychologist was also interested in the effects of a restricted diet on memory functioning and he expected memory to become impaired. The psychologist’s hypothesis was that participants’ scores on a memory test are lower after a restricted diet than before a restricted diet. He gave the volunteers a memory test when they first arrived in the research unit and a similar test at the end of the four-week period. He recorded the memory scores on both tests and analysed them using the Wilcoxon signed ranks test. He set his significance level at 5%.

His calculated value was T = 53.

State whether the hypothesis for this study is directional or non–directional.

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