A medical researcher claims that smoking can result in the wrinkled skin around the eyes. The researcherrecruited 150 smokers and 250 nonsmokers to take part in an observational study and found that 95 ofthe smokers and 105 of the nonsmokers were seen to have prominent wrinkles around the eyes (based ona standardized wrinkle score administered by a person who did not know if the subject smoked or not).Construct and interpret a 95% confidence interval for the true difference in the proportions of smokers andnonsmokers who have wrinkled skin around the eyes.

Given Information: Smokers: n1=150 x1=95 Nonsmokers: n2=250 x2=105 Confidence level is 95%

Answered: A medical researcher claims that…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A poll commissioned by the Center on Addiction and Substance Abuse at Columbia University found that 1,340 out of 2,000 adults interviewed believed that popular culture encourages drug use. Find a 98% confidence interval for the true proportion of adults nationwide having the belief. (Z score for 98% = 2.326)
A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages. Construct a 95% confidence interval for the proportion of adults who have a Facebook page.
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A study is conducted by a physical therapist to determine whether there is a difference in the proportion of men and women in the U.S. that participate in regular sustained physical activity. It is found that 22% of menout of 550 and 19.5% of women out of 450 participated in regular sustained physical activity. Construct a 90% confidence interval for the difference in proportions of men and women that participate in regular sustained and state your conclusion.
Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,075 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,075 surveyed, 479 indicated that they were satisfied. Construct a 95% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. What are the null and alternative hypotheses? Ho: p = 0.44 versus H,: p 0.44 (Round to two decimal places as needed.) Use technology to find the 95% confidence interval. The lower is The upper bound is (Round to two decimal places as needed.)
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