Ten years ago the mean Math SAT score of all high school students who took the exam in a small high school was 490, with a standard deviation of 80. This year, a researcher took the scores of a random sample of 16 students in the high school who took the exam. (xbar) The mean score of these 16 students is = 530. In addition, the researcher assumes that the population standard deviation continues to be o= 80. The researcher will test if there is evidence that the scores in the district have changed with two approaches: (i) test of significance; and (ii) confidence interval.

Q: What is the correct answer ? I have to show work.

A: Given Information: Sample size (n) = 22  Mean (u) = 12 Standard deviation (s) = 5.4

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A: Let's solve.

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A: First three parts are as solved before.

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A: C= 10

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