Question

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

Answer 1

72 60 83- 63 17 2 2. tl0.60