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then we use 27 Find the critical value SELECT ALL APPLICABLE CHOICES A) 0.352 B) 7.815 C) 8.481 D) 0.315 corresponding to a sample size of 4 and a confidence level of 90.0 percent 28 The confidence Interval for the mean is given SELECT ALL APPLICABLE CHOICES A) False B) True 29 In a clinical test with 570 subjects, 135 showed improvement from the treatment. Find the margin of error for the 95.0 percent confidence interval used to estimate the population proportion that showed improvement. SELECT ALL APPLICABLE CHOICES A) B) 0.02141 0.0349 C) None of These 30 IF SELECT ALL APPLICABLE CHOICES A) z - distribution B) t - distribution σ is KNOWN and n >30 then we use

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27)Level of confidence c -0.90 α-1-0.90-0.10 df=n-1-4-1 = 3 Critical values 2 -,2 xã =xf-α/2 =X2-0.10/2 = 0.352 using chi-square dist table) Option A is correct 28) Confidence interval of the mean is x-E TRUE Option B is correct H+HE29) Given x -135, and n-570 Population proportion p-=--0236842 c-0.95 α=1-0.95-0.05 Z-7e2 -70025 -1.96 (Using z value table) 570 Margin of eror -9 0236842(1-02368946) Margin of error (b) Za2 -0.034902 Option C is correct 30 Z-distribution is used 570 Option A is cormec

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