A new study has found that, on average, 6-to 12-year-old children are spending l

Question

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 Level:s X1 = 32 minutes S1 = 4.2 minutes n1 = 30 2008 Levels X2 30 minutes s2 = 4.1 minutes n2 = 30 Which of the following is the correct value of the test statistic assuming that the unknown population variances are equal? t59 =-1.8664 z= 1.8664 z =-1.8864 t58-1.8664

Explanation / Answer

Option-B) Normal distribution                                                                                                                                                                                                                                                                                               

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