stat hw 5

# stat hw 5 - b The width of the confidence interval would...

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6.10 b) about right overweight underweight female 67% 30% 2% male 77% 4% 19% d) Similar percentages of males and females perceive their weight as about right, although more males do, but many more women believe their overweight where as many more men believe they’re underweight. 9.9 a) P-hat because this symbol is used to show measurements for a given sample. b) P because this symbol is used to show results for an entire population. c) P-hat because this symbol is used to show results for a given sample. 9.11 a) What proportion of the surveyed parents in this school district support the new controversial education program? b) The population parameter is the total proportion of parents with children in the school district that would support the plan, and the symbol would be p. c) The sample estimate in this study is proportion of parents in the sample (104/300) that would support the new program. 10.13 a) The width of the confidence interval would increase because for a 99% confidence level, the multiplier is greater than it would be at 95%.

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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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stat hw 5 - b The width of the confidence interval would...

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