A new study has found that, on average, 6- to 12-year-old children are spending less time...
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 | 2008 Levels |
| x¯1= x¯1= 29 minutes | x¯2= x¯2= 23 minutes |
| s1 = 3.6 minutes | s2 = 4.5 minutes |
| n1 = 30 | n2 = 30 |
Which of the following is the correct value of the test statistic
assuming that the unknown population variances are equal?
a) z = –5.70
b) t58 = 5.70
c) z = 5.70
d) t59 = –5.70
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