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13 57 A new study has found that on average 6 to 12 year old...

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13 57 A new study has found that on average 6 to 12 year old children are spending less time on household chores today compared to 1981 levels Suppose two samples representative of the study s results report the following summary statistics for the two periods 1981 Levels x 30 minutes s1 4 2 minutes n1 30 Which of the following is the correct value of the test statistic assuming that the unknown population variances are equal Multiple Choice Z 5 73 t59 5 73 t58 5 73 2021 Levels x 24 minutes 23 9 minutes n2 30 z 5 73

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