A restaurant would like to estimate the proportion of tips that exceed​ 18% of its dinner bills. Without any knowledge of the population​ proportion, determine the sample size needed to construct a 96​% confidence interval with a margin of error of no more than 4​%to estimate the proportion. The sample size needed is

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given,margin of error(E)=0.015assume sample proportion(p^)=0.5α=1-0.975=0.025α2=0.0125Z0.0125=2.2414…

Q: What sample size is needed if a researcher needed to calculate the true proportion of individuals…

A: HERE , MOE  = 0.01 confidence level = 95% here z-critical for 95% confidence level = 1.96 here use…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given Information:Margin of Error, e=1%=0.01Confidence Level, c=95%=0.95

Q: A restaurant would like to estimate the proportion of tips that exceed​ 18% of its dinner bills.…

A: The provided information is:

Q: To the 95 per cent confidence level, find the confidence interval estimate of all college students…

A:

Q: The 92% confidence interval for the true proportion of Lexus cars in Muscat city is 0.1<P<0.2. What…

A: Obtain the point estimate of the proportion. The point estimate of the proportion is obtained below:…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given: Margin of error (E) =0.05. Confidence interval =95%. Z value for 95% confidence interval is…

Q: A recent Gallop poll showed that 672 of 1019 adults nationwide think that marijuana should be…

A:

Q: A recent study among 150 street hawkers in Cape Town showed that 48 of them are of the opinion that…

A: We have to find the length of confidence interval for the proportion.

Q: What is the minimum required sample size to make a 97% confidence interval for a population…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Confidence interval provides an estimated range of the true value which tells about the population…

Q: A researcher wants to estimate, at 92% confidence level, the prportion of covid-19 symptomatic…

A: Solution: From the given information, confidence level is 0.92 and E=0.03.

Q: In a certain village in Turkey, a sample of 250 cl of drinking water is examined and it is found out…

A:

Q: What is the minimum sample size needed to construct a 95% confidence interval of the population…

A: Solution: From the given information, confidence level is 0.95 and E=0.05.

Q: If n=320 and (p-hat) =0.94, find the margin of error at a 95% confidence level Give your answer to…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given that  Margin of error=E=3%=0.03 95% confidence  level

Q: A national polling organization wishes to gener- ate a 98% confidence interval for the proportion of…

A: Given data,E=3%=0.03Let p=0.50z-value at 98% confidence is Zc=2.326n=?

Q: If n=330 and (p-hat)=0.62, find the margin of error at 95% confidence level  Give your answer to…

A: Given data,n = 340P'= 0.62The z value at 95% confidence  level is zα2 = 1.96Margin of Error (E) =…

Q: A local health center noted that in a sample of 400 patients, 80 were referred to them by the local…

A:

Q: A large trucking company wants to estimate the proportion of its trailer truck population with…

A: Solution: From the given information, n=200, p-hat is 0.30 and the confidence level is 0.90.

Q: An environmentalist would like to estimate the true mean weight of all cars. To do so, she selects a…

A: We have given that,  The 90% confidence interval for true mean weight to be 2.8 to 3.4 .  Then,  We…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: It is given that margin of error (E) is 0.005 and the confidence level is 97.5%.

Q: A pilot sample of 75 items was taken, and the number of items with the attribute of interest was…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: The random variable X follows binomial distribution. The margin of error is 0.01. The level of…

Q: We plan to sample students to construct a 98% confidence interval for the proportion who uses Yelp…

A:

Q: The standard error used in calculating a 95% confidence interval for the difference in the average…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: From a random sample of 120 students, 95 rated a case of plagiarism as unethical. Using this…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: When nothin is known about the population proportion, Consider population proportion (p) = 0.50…

Q: The Center for Disease Control and Prevention (CDC) estimates that, on average, 5% to 20% of the…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Use EXCEL…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A company wants to estimate, at a 95% confidence level, the proportion of all families who own its…

A:

Q: .A research and development engineer is preparing a report for the board of directors on the battery…

A: Given a research and development engineer is preparing a report for the board of directors on…

Q: A local non-profit group would like to estimate the proportion of residents of Okeechobee county who…

A:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: From the given information, the margin of error (E) is 0.005 and the confidence level is 97.5%.

Q: A large trucking company wants to estimate the proportion of its tracker truck population with…

A:

Q: A simple random sample of 800 individuals provides 100 Yes responses. a. What is the point estimate…

A: Given,

Q: What is the smallest sample size needed to guarantee that the results of a study conducted to find…

A: Solution: a. From the given information, confidence level is 0.95, p=0.21 and E=0.03.

Q: An HR administrator wishes to know the proportion of employees that are currently using a very…

A: It is given that margin of error (E) is 0.14 and the confidence level is 0.80.

Q: The Labor Bureau wants to estimate, at a 90% confidence level, the proportion of all households that…

A: Computing the sample size: The confidence level is 90%. Therefore, α = 0.10 and α/2=0.05. The margin…

Q: It is desired to estimate the proportion of cannabis users at a university. What is the sample size…

A: Here, CL=0.95 and E=0.10.

Q: A local health centre noted that in a sample of 400 patients, 80 were referred to them by the local…

A: From the provided information, Sample size of patients (n) = 400 80 were referred by the local…

Q: A local health centre noted that in a sample of 400 patients, 80 were referred to them by the local…

A: Confidence interval: The (1-α) % confidence interval for proportion p is given by,

Q: An educator wants to construct a 99% confidence interval for the proportion of elementary school…

A: The random variable is elementary school children in Michigan who are proficient in reading. It…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: It is given that margin of error (E) is 0.01 and the confidence level is 95%.

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: A consumer agency estimate the proportion of all drivers who wear seat belts while driving. What is…

A:

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.