A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate tobe within 0.03 with 99% confidence if(a) she uses a previous estimate of 0.567(b) she does not use any prior estimates?Click the icon to view the table of critical values.(a) n= (Round up to the nearest integer)Com

Here we can use the formula for sample size given as follows n=zα/22*p1-pE2 Here n = sample size p…

Answered: Aresearcher wishes to estimate the…

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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How large a sample size is needed to estimate the incidence of female breast cancer in population with 95% confidence and a margin of error that is no greater than 1% (0.01)? Assume that the expected incidence proportion in the population is 3% (0.03). How large a sample would be needed if you were willing to settle for 90% confidence? What was the effect of decreasing the required level of confidence?
A. For this test, what is the critical value of an a-level of 0.05?
A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 99% sure that the point estimate (estimate of P) will be within a distance of 0.04 from p?
A manufacturer producing cocacola drinks wanted to set the specification of production to achieve process capability. He set his Upper Control Limit (UCL) = 0.03, proportion of defective items as 0.02. Calculate the number of sample observations (n) to be used to ensure 99.74 of the value.
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Determine the critical value zα/2 that corresponds to the given level of confidence, rounding to two decimal places. 96%
You are conducting a two-tailed test of a claim about a population proportion .If α=0.02, find the positive critical value, to two decimal places. _____________
A random sample of medical files is used to estimate the proportion p of all people who have blood type B. If you have no preliminary estimate for p, how many medical files should you include in a random sample in order to be 99% sure that the point estimate will be within a distance of 0.07 from p?
a researcher wants to estimate a population proportion with a margin of error of 0.05. What is the smallest sample size for which the sample proportion would be within 0.05 of the actual population proportion for 95% of all random samples?
During a blood-donor program conducted during finals week for college students, a blood-pressure reading is taken first, revealing that out of 350 donors, 40 have hypertension. All answers to three places after the decimal. Covering the worst-case scenario, how many donors must we examine in order to be 95% confident that we have the margin of error as small as 0.01? Using a prior estimate of 15% of college-age students having hypertension, how many donors must we examine in order to be 99% confident that we have the margin of error as small as 0.01?
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Approximately one-third of Canadians have some form of privately-covered long-term disability insurance. If random groups of 165 Canadians are sampled, find the range of values that the middle 95% of the sample proportions of those with long-term disability health insurance are likely to fall. = ? < p̂ < ? Round to four decimal places if necessary Enter 0 if normal approximation cannot be used

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Aresearcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 99% confidence it (a) she uses a previous estimate of 0.567 (b) she does not use any prior estimates?