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 two percentage points with 95​% ​confidence, assuming that ​(a)he uses the estimates of 21.5​% male and 19.5​% female from a previous​ year? ​(b)he does not use any prior​ estimates?

Q: How many students should be sampled in order to be 90% confident in estimating the proportion in…

A: Given that  Margin of error =E =0.10 90% confidence.

Q: An optometrist wishes to know the proportion of patients who undergo laser eye surgery who end up…

A:

Q: quality conscious disc manufacturer wishes to know the fraction of disks his company makes which are…

A: Given Sample size =865 X=112

Q: If the auditor needed a point estimate for the population mean for all accounts at this bank, what…

A: here given ,  A federal auditor for nationally chartered banks, from a random sample of 100…

Q: A university dean of studentswishes to estimate the average number of hours studentsspend doing…

A:

Q: Suppose a certain Statistics instructor wants to estimate the proportion of students who enjoy…

A: Given datamargin of error=0.03

Q: In order to estimate the population proportion with a high school education,  you need a minimum…

A:

Q: Suppose a clothing store wants to determine the current percentage of customers who are over the age…

A:

Q: A researcher wants to calculate the prevalence of Alzheimer’s among members of a specific community…

A: Solution: Given information: Margin of error = E= 0.01 Population proportion = p = 0.1073 Confidence…

Q: We are interested in conducting a study in order to determine what percentage of voters would vote…

A: Given that, If the prior information is unknown assume that the sample proportion  is 0.50 Critical…

Q: A researcher wants to calculate the prevalence of Alzheimer’s among members of a specific community…

A: Option 1 A) n=3794 Explanation:

Q: Suppose an automotive repair company wants to determine the current percentage of customers who keep…

A:

Q: A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which…

A:

Q: The mean of the sampling distribution of the sample mean is smaller than the mean of the…

A: According to Central limit theorem, when repeated sample of size n is drawn from a population with…

Q: The state education commission wants to estimate the fraction of tenth grade students that have…

A: The proportion of tenth graders reading at or below the eighth grade level is calculated below:

Q: A coworker says she needs to test 5000 subjects in order to have enough power to detect a…

A: Here for the above question, effect size is related with a sample size. As we know a test is…

Q: Due to recent trends in the childcare industry, the firm suspects that the that the mean annual…

A: Solution: Given information: n1=20 Sample size of Illinoisn2= 20 Sample size of…

Q: 4. A researcher wants to calculate the prevalence of Alzheimer’s among members of a specific…

A: Sample Size: The formula for the sample size is as follows: Here, zα/2 is the critical value at 95%…

Q: 4. A provincial Hospital wants to estimate the proportion of the patients with high Unk Acid who…

A: Let p^ be the sample proportion and q^=1-p^ E is the error of margin. E=Zα2p^q^n Hence, the required…

Q: Suppose a clothing store wants to determine the current percentage of customers who are over the age…

A:

Q: - Suppose the Department of Energy in the Philippines surveyed 200 gasoline stations to determine…

A: a)In the given case, gasoline at all the gas stations is the population whereas the gas stations…

Q: Teip An advocacy organization surveys 967 citizens of country A and 182 of them reported being born…

A: Sample proportion: Sample proportion is the proportion of individual in a sample with specific…

Q: According to the Law of Large Numbers what effect will increasing the sample size have on the sample…

A: It is given that the sample size increases.

Q: In this scenario, what is the test statistic? The medical billing specialist would like to test the…

A:

Q: A recent survey estimated that 19 percent of all people living in a certain region regularly use…

A: The 100 (1 – α)% confidence interval provides an interval estimation of the required population…

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Given : p = 0.77 x = 14 n = 28 p^ = xn    = 1428    = 0.5

Q: A gas station attendant would like to estimate p, the proportion of all households that own more…

A: Here the problem is under calculation. The gas station attendant trying to find the proportion of…

Q: Are freshmen psychology majors more likely to change their major before they graduate compared to…

A: Given Information :   344 of the 618 freshmen psychology majors from a recent study changed their…

Q: The executives at Sandbachian, Inc., has recently solved their widget crisis, have another problem…

A:

Q: What is the point estimate of the true proportion of people in the population who are over 6 feet…

A: Given that, Sample of 50 peoples is to be drawn and out of which 14 are possessing  characteristic…

Q: A researcher measures eye color for a sample of n = 50 people.  Which measure of central tendency…

A:

Q: 4. There is a significant difference between the proportion of male and the proportion of female…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A political campaign manager wishes to survey a number of voters to estimate the proportion of those…

A:

Q: 1. How many samples must be considered from a population of 28,000 students, if 5% margin of error…

A:

Q: A researcher selects all of the possible samples with n = 8 scores from a population and computes…

A: The mean of the sampling distribution of the sample mean is an unbiased estimator for population…

Q: Has the law that mandates the use of bicycle helmets failed? The National Cycling Association wants…

A: Dear students as per guidelines we answer the first three subparts only. Solution To find confidence…

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Margin of Error ME= 0.06 Confidence level c= 0.90

Q: A researcher wants to calculate the prevalence of Alzheimer's among members of a specific community…

A: Given: Margin of error = 1.0% Sample proportion = 11.11%

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Confidence level = 0.95, margin of error = E = 0.08.

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Given information- Sample size, n = 31 Significance level, α = 0.01 Sample proportion- Hypothesis…

Q: If the population proportion is 0.7 . A researcher wants the margin of error to be 0.20 and the…

A: Given  pcap=0.7, Zcritical=1.96 at alpha=0.05 MOE=0.20

Q: What proportion of the distribution of sample means is greater than a z of -1

A: The standard normal variable Z follows normal distribution with mean 0 and standard deviation 1.

Q: To estimate the population mean µ with a 85% error margin of 2.5 units, 10) one has determined that…

A:

Q: What proportion of the distribution of sample means is between a z  of 1.34 and z of -1.00?

A: P(1.34<z<-1.00)=?

Q: UNGOS NATIONAL HIGH SCHOOL – Lubayat Extension has an average number of students per section of 32,…

A: Given  Population Mean = 32 Sample values = 28 and 34 Sample Mean = 31

Q: What will happen to the mean of the sampling distribution of the sample means if the sample size…

A: Definition of sampling distribution: If X have any distribution and  sample size is sufficiently…

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: From the given information, Margin error (E) = 0.03 Assume sample proportion = 0.5   The objective…

Q: Too many outliers on our sample data is acceptable as long as data are summarized and presented by…

A:

Q: Suppose an advertising company wants to determine the current percentage of customers who read print…

A: Given dataError = 5% = 0.05Confidence level = 0.98Significance level = α=1-0.98=0.02

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.