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Unformatted text preview: b) The width of the confidence interval would decrease because for a 90% confidence level, the multiplier is lesser than it would be at 95%. 10.17 a) p = 132/439 b) sqrt( .21/439) = .022 c) .3 + 2(.022) = .256  .344 or 25.6% to 34.4% 10.18 a) The center because this represents the base measurement from the sample. b) The width because it affects the standard error. c) The width because the margin of error just goes to figure how much deviation there is from the center. d) The width, because this impacts the multiplier we would use. 10.19 a) 166/200 = .83 b) sqrt (.1411/200) = .027 x 2=.054 .83 + .054 = .776.884 or 77.6% to 88.4% With 95% confidence we can say that in the population of patients with the disease, the amount who would e cured from the treatment is within this interval. 10.23 a) .90 b) .95 c) .98 d) .99 10.35 a) 2 x (sqrt((.56 x .44)/100)) = .0993 b) 2 x (sqrt((.56 x .44)/400)) = .0496...
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 Spring '08
 BARROSO,JOAOR
 Statistics, Normal Distribution, 2%, right overweight underweight

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