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6. There is a study about the relation between number of one's sleeping hours on the night before a statistics exam and the performance on that statistics exam (higher score indicates better performance). The data are displayed below. No. of sleeping hours Performance 0 60 12 9O 6 70 2 60 At a signicance level of .05 and with a twotailed test, test whether there is a correlation between number of sleeping hours and performance. Please state the hypotheses, compute the test statistics, and state your decision. (10 marks)