A quality control expert wants to estimate the proportion of defective components that are being manufactured by his company. A sample of 300 components showed that 30 were defective.  How large a sample is needed to estimate the true proportion of defective components to within 2.5 percentage points with 95% confidence?

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: Your professor wishes to estimate the proportion of high school students enrolled in college-level…

A: Given: margin of error of 3.5 percent 99% confidenp p= 18.3%

Q: A DNP student wants to evaluate the change in knowledge scores of a group of cardiac patients after…

A: In given problem, a DNP student obtains a pretest at the beginning of class and immediately after…

Q: Estimate the chance that the sample proportion was more than 45% using a normal approximation.

A: Given information: Given that , 40 % of the primary doctors have made claim that their patients…

Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: based on the estimation what is the appropriate conclusion?

A: Let p be the population proportion of all people living in a certain region.Given that,sample…

Q: If you want to be99​% confident of estimating the population proportion to within a sampling error…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of the…

Q: A doctor wants to estimate the mean HDL cholesterol of all​ 20- to​ 29-year-old females. How many…

A: Find z-critical value:…

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

A: We know that,  If P is population proportion and  p^ is sample proportion then standard error of…

Q: You want to obtain a sample to estimate the percentage of college students in the U.S. that get a…

A: It is given that margin of error (E) is 0.03 and the confidence level is 0.95.

Q: A rare birth defect occurs in approximately 0.5% of all cases in males. If we sample all the males…

A: Given information: The total number of males born in 2016 in a specific region is N = 200,000. It is…

Q: How large a sample is necessary to estimate the true proportion of unmarried Canadians aged 25-29…

A: Given data: Margin of error  = 5% = 0.05 Confidence level  = 0.90 To find: Sample size (n) = ?

Q: A researcher wishes to estimate the number of households with two computers. How large a sample is…

A: given data   CI = 0.90, P ( - Z< P < Z ) = 0.90 therefore z = 1.645 ( =z table ) E = 6% =…

Q: A company wants to know the proportion of consumers willing to buy their product. How many people…

A: Given that ME=margin of error=1.5%=0.015z=critical value off 90% confidence…

Q: researcher wishes to estimate the proportion of the adult population of the U.S. has sleep…

A: E=0.03 99% confidence interval for z=2.576 p=0.5

Q: In a survey of 323 adults over 50, 60% said they were taking vitamin supplements. Find the margin of…

A:

Q: The local school is conducting another survey to determine the proportion of students at the school…

A: Confidence interval is defined as the range that contains the value of the true population…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Solution: From the given information, confidence level is 0.96 and E=0.02.

Q: The mean GPA for 138 residents of the local apartment complex is 1.9. What is the best point…

A: Solution: From the given information, the mean GPA for 138 residents of the local apartment complex…

Q: If you want to be 95​% confident of estimating the population proportion to within a sampling error…

A: z-critical value at alpha(0.95) = 1.96 margin of error =0.08   p = 0.5

Q: You want to estimate the percentage of small incorporated businesses that are owned by women. A…

A: The random variable percentage of small incorporated businesses follows binomial distribution. The…

Q: An event marketing executive thinks that the proportion of consumers who have seen his company’s…

A: In general terms, the larger the sample size n, the more precise of an estimate can be obtained of…

Q: Find the critical value that corresponds to 95% confidence for a mean and n = 35.

A: Given that - Find the critical value that corresponds to 95% confidence for a mean and n = 35.

Q: You are testing the difference between a sample mean and a population mean in a one-tailed test that…

A:

Q: To determine the proportion of Americans who support affirmative action policies for minorities and…

A: The objective is to define the sample size for estimating the true proportion of Americans, who…

Q: A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many…

A: Given information Standard deviation s = 16.4 Confidence interval = 0.95 Significance level(α) = 1-…

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.95.

Q: ou want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A:

Q: How can compute the mean of the failure conditions by multiplying each "failure" mean by 0.5?

A:

Q: A histological test for cancer has sensitivity, specificity, positive predictivity, and negative…

A: To find, Which of the four indicators would you use to reassure a patient that the positive result…

Q: estimated that 80% of people with type 2 diabetes are overweight. You want to do a study on type 2…

A: Given Data : Margin of error: ME = 0.0463 sample proportion: p̂ = 0.8…

Q: The proportion of junior executives leaving large manufacturing companies within three years is to…

A:

Q: You are conducting a study to estimate the mean height of students in a university. The university…

A: To calculate the sample size required to estimate the mean height of students in the university with…

Q: A sample proportion is calculated from a sample size of 132. How large of a sample would we need in…

A: given data  sample size (n) = 132 how large the sample required to decrease standard error by factor…

Q: What size sample should be obtained to be 95% confident that the sample proportion will not differ…

A: Suppose p is the true population proportion.