A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if she wishesthe estimate to be within three percentage points with 95% confidence, assuming that(a) she uses the estimates of 22.2% male and 19.7% female from a previous year?(b) she does not use any prior estimates?(a) n = (Round up to the nearest whole number)CHCEM

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Answered: A physical therapist wants to determine…

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 physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if he wishes the estimate to be within three percentage points with 95% confidence, assuming that (a) he uses the estimates of 22.4% male and 19.2% female from a previous year? (b)he does not use any prior estimates? (a) n= (Round up to the nearest whole number.) (b) n= (Round up to the nearest whole number.)
For this question, how large of a sample size would be required if we wanted to estimate p to within (0.03) with (95%) confidence? Please provide details
A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if she wishes the estimate to be within five percentage points with 95% confidence, assuming that (a) she uses the estimates of 22.9% male and 19.5% female from a previous year? (b) she does not use any prior estimates?
In a random sample of 500 teenagers 12 to 17 years old, it was found that 330 have regular access to computers and the Internet. What sample size should you take to be 95% confident that the estimate of the true proportion of teenagers 12 to 17 years old with regular access to computers and the Internet will differ by no more than 0.03? Use the point estimate from the given sample as a prior estimate proportion.
A researcher wishes to estimate the frue proportion of all speeders who exceed the posted speed limit on a particular stretch of road in the Canyonlands National Park where there are frequent accidents. How large should the sample be so that with 97 percent confidence, the sample proportion will not differ from the true proportion by more than 0.311?
b) Based on sample size of N=31 and sample statistics x = 50.6077 unit, s², = 1.9874 unit? determine the whole population statistics at 90% confidence level, also estimate the population mean from the sample data at 95% confidence level.
Suppose I want to sample the household incomes for EBR parish. Let's say I start with a simple random sample of 100 residents and calculate the sample mean. How would the sampling distribution of change if I increase the sample size to 1,000 residents?
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 to be within 0.01 with 90% confidence if (a) she uses a previous estimate of 0.38? (b) she does not use any prior estimates?
A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if he wishes the estimate to be within five percentage points with 99% confidence, assuming that (a) he uses the estimates of 21.6% male and 18.7% female from a previous year? (b) he does not use any prior estimates?
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 to be within 0.03 with 90% confidence if (a) she uses a previous estimate of 0.34? (b) she does not use any prior estimates?
A physical therapist wants to determine the difference in the proportion of men and women who participate in regular sustained physical activity. What sample size should be obtained if she wishes the estimate to be within three percentage points with 90% confidence, assuming that (a) she uses the estimates of 21.7% male and 18.7% female from (b) she does not use any prior estimates? previous year? (a) n= (Round up to the nearest whole number.) (b) n= (Round up to the nearest whole number.)

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