*1. The national norm for third graders on a standardized testof reading achievement is a mean score of 27 ? 4 . Racheldetermines the mean score on this test for a random sample of thirdgraders from her school district. (a) Phrase a question about herpopulation mean that could be answered by testing a hypothesis. (b)Phrase a question for which an estimation approach would beappropriate.
Needing problem 2 answered, but question 1 goes along with theproblem.
*2. The results for Rachel’s sample in Problem 1 is X=33.10(n=36). (a) Calculate ?X . (b) Construct the 95% confidenceinterval for her population mean score. (c) Construct the 99%confidence interval for her population mean score. (d) Whatgeneralization is illustrated by a comparison of your answers toProblems 2b and 2c? Explain in precise terms the meaning of theinterval you calculated in Problem 2b.
