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A psychologist obtains a random sample of 20 mothers in the first trimester of their...

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A psychologist obtains a random sample of 20 mothers in the first trimester of their pregnancy The mothers are asked to play Mozart in the house at least 30 minutes each day until they give birth After 5 years the child is administered an IQ test It is known that IQs are normally distributed with a mean of 100 If the IQs of the 20 children in the study result in a sample mean of 104 1 and sample standard deviation of 14 7 is there evidence that the children have higher IQs Use the a 0 10 level of significance B The Student s t distribution because the parameter is the mean a is not known and the model conditions are satisfied OC The normal distribution because the parameter is the mean G is known and the model conditions are satisfied OD The normal distribution because the parameter is a proportion p and the model conditions are satisfied Calculate the test statistic Test statistic 1 28

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