Question

An educator wants to determine whether early exposure to school will affect IQ. He enlists the aid of the parents of 12 pairs of preschool-age identical twins who agree to let their twins participate in his experiment. One member of each twin pair is enrolled in preschool for 2 years, while the other member of each pair remains at home. At the end of the 2 years, the IQs of all the children are measured.  

1. Research Hypothesis:
2. Null Hypothesis:
3. Statistical test to use:
4. Degrees of freedom
5. Using α = .05 significance level.

6. Critical value = ________________ Test statistic = ________________

IQ

                                    Twins at                                  Twins at

Pair                             Preschool                                Home

   1                                   120                                         114

   2                                   121                                         118

   3                                   127                                         103

   4                                   117                                         112

   5                                   115                                         117

   6                                   120                                       106

   7                                   130                                         115

   8                                   119                                         113

   9                                   121                                         109

10                                  120                                         112

11                                  117                                         116

12                                  121                                         104

Please help. Show all steps with answers and formulas used.

Answer 1