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 90% confidence, assuming that (a) he uses the estimates of 21.1% male and 18.9% female from a previous year? (b) he does not use any prior estimates? (a) n= (Round up to the nearest whole number.)

Q: 4. A teacher noted that the mean scores of a random sample of 15 grade 8 students who had taken a…

A:

Q: Use the t-distribution and the sample results to complete the test of the hypotheses.

A: The sample size is n = 100 Sample mean = 105.1 And sample SD = 15.5 Level of significance = 0.05

Q: determine its credit policies quite carefully. Suppose that the firm suspects that advertisements in…

A: The firm wants to establish 90% confidence interval for this magazine’s write-off proportion that is…

Q: What is the approximate sample size required to estimate the percentage of Americans who have earned…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: What does brand loyalty mean to consumers? According to a recent research report, 42% of consumers…

A: We have to find the sample size for the given margin of error and proportion.

Q: A simple random sample of 900 individuals provides 100 Yes responses. a. What is the point estimate…

A: Given,n=900X=100p^=Xnp^=100900p^=0.11111-p^=0.8889α=1-0.95=0.05α2=0.025Z0.025=1.96       (from…

Q: A simple random sample of 700 individuals provides 100 Yes responses. a. What is the point estimate…

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Q: Suppose we want to determine the proportion p of all Canadians who agree with the statement: “Prime…

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Q: A simple random sample of 400 individuals provides 100 Yes responses. a. What is the point estimate…

A: We have given that  Favourable cases, X = 100 Sample size, n = 400 Sample proportion, p^ = X/n

Q: An article in the October 11, 2006, issue of the Washington Post claimed that 15% of high school…

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Q: The national Council of Small Businesses wishes to construct a 95% confidence interval for the…

A: In this question, it has been given that margin of error = 0.10,Level of significance = 0.05,We have…

Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

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Q: A quality control inspector makes it clear that in order for an item to be acceptable, the…

A: Given: Margin of error (E): E=0.0712 Population variance: σ2=8.85 Confidence level (c) =0.99α=1-c…

Q: Based on this output, what are the sample mean income and standard error of the mean income –…

A: By the given output, we can observe that Mean=$79189.87 Standard error of sample mean=$1663.489…

Q: a. How many workers are there in each stratum? b. Estimate the mean forced vital capacity among the…

A: Here population is 1200(i.e. workers employing at a plant). Out of 1200 sample is taken of size 40.…

Q: An analyst is planning to estimate the mean of a quantitative variable using a 95% confidence…

A: Given that, Critical value: Using the z-table, the critical value at 95% confidence level is

Q: Given that the sample proportion of Americans who are dissatisfied with the quality of education is…

A: Given information: p=0.53 M.E=0.05Confidence level=95% Use the excel formula, "=NORM.S.INV(0.975)"…

Q: Find the smallest sample size needed to estimate the population proportion for a margin of error of…

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Q: What is the smallest sample size required to provide a 95% confidence interval for a mean, if it…

A: Given problem is : What is the smallest sample size required to provide a 95% confidence interval…

Q: what is the sampling error desired?  In a sample of n=19 lichen​ specimens, the researchers found…

A: We hàve to find samplé size required.

Q: Find the margin of error for a​ 95% confidence interval for estimating the population mean when the…

A: Sample S.D = s = 110

Q: A símple random sample of size 100 has mean 15, the population variance being 25. Find an interval…

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Q: What sample size is needed to estimate a population mean within t 70 of the true mean value using a…

A: According to the provided information, Population standard deviation (σ) = 140.625 Confidence level…

Q: Two competing airlines, Alpha and Beta, fly a route between Des Moines, lowa, and Wichita, Kansas.…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 90% Proportion (p1) =…

Q: Suppose you wish to estimate the average height of adults using a sample of 20 adults where the mean…

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Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: a. From the given information, Margin of Error ME=0.04p=0.5q=1-p=1-0.5=0.5zα2=z0.012=z0.005=2.576…

Q: In a study of government financial aid for college students, it becomes necessary to estimate the…

A:

Q: i. With what degree of confidence can one deduce that the confidence limits of the actual proportion…

A: here given ,  sample size n = 5000 and sample proportion car having cameras = 10005000 = 0.2

Q: Suppose you observe 62 data points from a distribution with standard deviation 2.1, and you…

A: Given, n=62 data points standard deviation SD= 2.1, calculated a 92% two-sided confidence interval…

Q: Assume that all​ grade-point averages are to be standardized on a scale between 0 and   4. How…

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Q: 4. A teacher noted that the mean scores of a random sample of 15 grade 8 students who had taken a…

A:

Q: Calculate the sample size needed in order to estimate the true proportion of defective in a large…

A:

Q: 3. A government agency wishes to estimate the proportion of drivers aged 16–24 who have been…

A: Here is given that, margin of error is 1% = 0.01 Proportion is 0.12 We will use z-proportion to…

Q: In each of parts (a)-(c), we have given a likely range for the observed value of a sample proportion…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: An epidemiologist with the Florida Department of Health needs to estimate the proportion of…

A: Given,sample proportion(p^)=0.951-p^=1-0.95=0.05margin of…

Q: In a study of government financial aid for college students, it becomes necessary to estimate the…

A: Given: e=0.01 a) Assume p=0.5 and q=0.5. From the Standard Normal Table, the value of z* for 90%…

Q: The length, in words, of the essays written for a contest are normally distributed with a population…

A: According to the provided information, Mean (x̅) = 1330 Standard deviation (σ) = 442 Sample size (n)…

Q: It is being desired to estimate the average daily emission, in tons, of sulfur oxides by a large…

A: A confidence interval  is a type of estimate computed from the statistics of the observed data. This…

Q: Suppose that a random sample of 11 scores from a population of test scores is to be used to estimate…

A: Chebyshev's rule and empirical rule and related to the proportion of data that falls with different…

Q: in a study of government financial aid for college students it becomes necessary to estimate the…

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Q: 9. Find the minimum sample size needed to be within a margin of error of 2% of the population…

A:

Q: Suppose that a state wants to access the public opinion on the proposal that drivers who are 65…

A: Given, Margin of error (MOE)= 0.025   p =probability of success= 0.5

Q: Assume that all​ grade-point averages are to be standardized on a scale between 0 and 6. How many​…

A:

Q: What does brand loyalty mean to consumers? According to a recent research report, 37% of consumers…

A:

Q: In a study of government financial aid for college students, it becomes necessary to estimate the…

A:

Q: Assume that all​ grade-point averages are to be standardized on a scale between 0 and 6. How many​…

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Q: If you wish to estimate a population mean with a sampling distribution error SE = 0.21 using a 95%…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.