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AP Statistics… z & t Intervals with Means Review. 1) What is the critical value for a 96% confidence interval for a sample of size 20? (( unknown) 2.054 d) 2.205. 1.96 e) 2.093. 2.197 2) Which of the following statements is true? A 95% confidence interval is narrower than a 90% confidence interval for the same set of data. ................
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