STAT 205 Quiz: STAT 205 South Carolina Quiz7 key
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The mean selenium concentration was 6. 21 g/dl and the standard deviation was 1. 84 g/dl. Construct and interpret a 95% con dence interval for the population mean. Answer: we have y = 6. 21, s = 1. 84 and n = 36. Here, = 0. 05 and from the table on the back cover of your book, t0. 025(35) 2. 04 (i rounded up to df = 30 to be conservative). = (5. 58, 6. 84), same as in your homework solutions for 6. 19. After six months y = 103 of the patients had new stds. Construct and interpret a 95% agresti-coull con dence interval for the probability of contracting an std within six months after counseling (as in the study). P = y + 2 n + 4. Se p = r p(1 p) n + 4. So a 95% ci for for the probability of contracting an std after counseling is. P 1. 96 se p = 0. 0728 1. 96(0. 0068)
