A psychologist obtains a random sample of 20 mothers in the first trimester of their pregnancy. The
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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 eachday until they give birth. After 5 years, the child is administered an IQ test. We know 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 104.2, and a sample standard deviation of 14.7, is there evidence that the children have higher IQs? Use the a = 0.05 level of significance.
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Hypotheses It is given that the sample is random and that the population is normally distribu...View the full answer
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Related Book For
Statistics Informed Decisions Using Data
ISBN: 9780134133539
5th Edition
Authors: Michael Sullivan III
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