Refer to the Applied Psycholinguistics (June 1998) study of language skills of low-income children, presented in Exercise.
Question:
a. Construct a 90% confidence interval for the mean sentence complexity score of all low-income children.
b. Interpret the interval you found in part a in the words of the problem.
c. Suppose we know that the true mean sentence complexity score of middle-income children is 15.55. Is there evidence that the true mean for low-income children differs from 15.55? Explain.
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