In a survey of 634 males ages 18-64, 390 say they have gone to the dentist in the past year.Construct 90% and 95% confidence intervals for the population proportion. Interpret the results andcompare the widths of the confidence intervals. If convenient, use technology to contruct theconfidence intervals.The 90% confidence interval for the population proportion p is (,)The 95% confidence interval for the population proportion p is ()please dont round to three decimals ill do the rounding because i see that some of the answers arecorrect but the way you guys round is wrong.

here n = 634 p^ = proportion of males gone to dentist pin past year = 390634 = 0.6151 z-critical for…

Answered: The 90% confidence interval for the…

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 market analyst is curious what proportion of Carolina residents have a landline. A survey of 94 randomly selected Carolina residents shows that 46 of those selected have a landline phone. The analyst wants to use this data to construct a sample z interval for a proportion. Based on this sample, which of the following is a 90% percent confidence interval for the proportion of residents who have a landline? Select one: a. The interval is (0.4233, 0.5555). b. The interval is (0.3565, 0.6222). c. The interval is (0.4045, 0.5742). d. The interval is (0.2831, 0.6956). e. The interval is (0.3883, 0.5904).
Using the accompanying colleges and universities data to find 95% confidence intervals for the mean SAT for each of the two groups, liberal arts colleges and research universities. Based on these confidence intervals, does there appear to be a difference in the median SAT scores between the two groups? For the liberal art colleges, the 95% confidence interval is? (Use ascending order.Round to four decimal places as needed.) For the research universities, the 95% confidence interval is? (Use ascending order. Round to four decimal places as needed.)
Using the accompanying colleges and universities data to find 95% confidence intervals for the median SAT for each of the two groups, liberal arts colleges and research universities. Based on these confidence intervals, does there appear to be a difference in the median SAT scores between the two groups? For the liberal arts colleges, the 95% confidence interval is?(round to four decimal places as needed) For the research universities, the 95% confidence interval is?(round to four decimal places as needed) Based on the results, does there appear to be a difference in the median SAT scores between the two groups?
A market researcher involved in the launch of a new product wishes to estimate the true value of the proportion of consumers that would recommend the new product to a friend, p. The researcher carries out a consumer survey and finds out of the 83 individuals questioned, 22 said yes, they would recommend the product. Estimate the true value of the proportion of consumers that would recommend the product by calculating a 95% confidence interval. Fill in the blanks in the following: An estimate of the population proportion is .The standard error is .The distribution is (examples: normal / t12 / chisquare4 / F5,6). For a 95% confidence interval the distributional cut-off is .It is quite likely that the true value of the proportion of consumers that would recommend the product, p, is between and . (2 dec places).
A recent survey of cell phone users indicated that 56 percent of the respondents prefer to use cell phones for texting rather than for making phone calls. A 95 percent confidence interval for the estimate of all cell phone users who prefer to use cell phones for texting has a margin of error of 3 percent. Assume all conditions for inference have been met. Based on the confidence interval, which of the following claims is supported? Select A, B, C, or D Less than half of all people prefer texting. A More than half of all people prefer texting. B At least 60 percent of all people prefer texting. C At least 75 percent of all people prefer texting. D At least 95 percent of all people prefer texting. E

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The 90% confidence interval for the population proportion p is (,) The 95% confidence interval for the population proportion p is (,)