Question 15 (1 point)
. Six pairs of identical twin children of preschool age were selected for an experiment. For each pair, one member was randomly assigned to an experimental group and the other to a control group. The children in the experimental group spent 2 hours a day for 6 months playing in a room well supplied with educational toys such as alphabet blocks, puzzles, ABC readers, coloring books featuring letters, and so forth. The children in the control group spent 2 hours a day for six months playing in a “noneducational” toy room. The age in months when the child began reading at the primary level was recorded, and the statistics are show below.
Experimental group B = Reading age |
Control group A = Reading age |
Difference d = A – B |
|
Mean |
60.83 |
63.17 |
2.34 |
SD |
5.91 |
7.47 |
2.16 |
If a test of significance using
H0:?d?0H0:?d?0
vs.
Ha:?d>0Ha:?d>0
is conducted, what will be the test statistic and p-value?
Question 15 options:
Z = 2.65; p-value = 0.004 |
|
t = 2.65; 0.01 < p-value < 0.025 |
|
t = 0.60; p-value > 0.2 |
|
t = 2.65; 0.025 < p-value < 0.05 |
Question 15 (1 point) . Six pairs of identical twin children of preschool age were selected...
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