Do educational toys make a difference in the age at which a child learns to read? To study this question, researchers designed an experiment in which one group of preschool children spent 2 hours a day (for 6 months) in a room well supplied with “educational” toys such as alphabet blocks, puzzle s, ABC readers, coloring books featuring letters, and so forth. A control group of children spent 2 hours a day for 6 months in a “non-educational” toy room. It was anticipated that IQ differences and home environment might be uncontrollable factors unless identical twins could be used. Therefore, six pairs of identical twins of preschool age were randomly selected. From each pair, one member was randomly selected to participate in the experimental (i.e., educational toy room) group and the other in the control (i.e., non-educational toy room) group. For each twin, data item recorded is the age in months at which the child began reading at the primary level. Test the hypothesis at 0.01. HinHint: The test is two-tailed.
