gator wants to test the hypothesis that the me is greater , for which it takes a sample of size 30 atistics ī = 49.05 and Sx = 14.80. Test the in 5. What is the observed level of significance oz nclusion with a = 0.10? Assume normal distri %3D

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8.21

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8.21 Suppose it is known that the intelligence quotient (Stanford-Binet) of the pop-
ulation made up of children between 9 and 13 years old has a mean of 45. An
investigator wants to test the hypothesis that the mean of a subgroup of this popu-
lation is greater , for which it takes a sample of size 30 from that subgroup and finds
the statistics T = 49.05 and Sx = 14.80. Test the investigator's hypothesis with a
= 0.05. What is the observed level of significance of the sample? What would be
%3D
the conclusion with a = 0.10? Assume normal distribution.
Transcribed Image Text:8.21 Suppose it is known that the intelligence quotient (Stanford-Binet) of the pop- ulation made up of children between 9 and 13 years old has a mean of 45. An investigator wants to test the hypothesis that the mean of a subgroup of this popu- lation is greater , for which it takes a sample of size 30 from that subgroup and finds the statistics T = 49.05 and Sx = 14.80. Test the investigator's hypothesis with a = 0.05. What is the observed level of significance of the sample? What would be %3D the conclusion with a = 0.10? Assume normal distribution.
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