Please solve for A, B, and C A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 3% of the true proportion.(a) No preliminary estimate is available. Find the minimum sample size needed.(b) Find the minimum sample size needed, using a prior study that found that 32% of the respondents said they think Congress is doing a good or excellent job.(c) Compare the results from parts (a) and (b).(a) What is the minimum sample size needed assuming that no prior information is available?n= (Round up to the nearest whole number as needed.)

given data, confidence interval =0.90α=1-0.90=0.10Z-critical value:Zc:=Zα/2=Z0.10/2=Z0.05=1.645 […

Answered: A researcher wishes to estimate, with…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.4: Collecting Data

Problem 2E

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A researcher wishes to estimate, with 99% confidence, the population proportion of families who eat fast food at least once per week. Her estimate must be accurate within 5% of the population proportion.Find the minimum sample size needed, using a prior study that found that 16% of the respondents said they eat fast food four to six times per week
A researcher wishes to estimate, with 95%confidence, the population proportion of adults who eat fast food four to six times per week. Her estimate must be accurate within 5% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 26% of the respondents said they eat fast food four to six times per week. (c) Compare the results from parts (a) and (b).
A researcher wishes to estimate, with 95% confidence, the population proportion of families who eat fast food at least once per week. Her estimate must be accurate within 5% of the population proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 16% of the respondents said they eat fast food four to six times per week
For a one-sample test for a population proportion and sample size , why is it necessary that andare both at least 10 ?(A) The sample size must be large enough to support an assumption that the distribution of the population isapproximately normal.(B) The sample size must be large enough to support an assumption that the distribution of the sample isapproximately normal.(C) The sample size must be large enough to support an assumption that the sampling distribution of the sampleproportion is approximately normal.(D) The sample size must be large enough to support an assumption that the observations are independent.(E) The sample size must be large enough to support an assumption that the sample proportion is an unbiasedestimator of the population proportion
Amie Jackson, a manager at Sigma travel services, makes every effort to ensure that customers attempting to make online reservations do not have to wait too long to complete the reservation process. The travel website is open for reservations 24 hours a day, and Amie regularly checks the website for the waiting time to maintain consistency in service. She uses the following independently drawn samples of wait time during two peak hours, morning 8 a.m. to 10 a.m. and evening 7 p.m. to 9 p.m., for the analysis. Assume that wait times are normally distributed. Wait Time (in seconds) Morning hours 8 a.m. to 10 a.m. 97 101 115 107 129 98 96 132 118 104 123 128 95 127 112 Evening hours 7 p.m. to 9 p.m. 95 92 89 90 102 96 85 81 84 100 97 80 98 79 99 At the 10% significance level, which of the following is the correct conclusion? Do not reject H0. We conclude that the variance of wait time during morning peak hours differs from that during the evening peak hours. Reject H0. We…
Amie Jackson, a manager at Sigma travel services, makes every effort to ensure that customers attempting to make online reservations do not have to wait too long to complete the reservation process. The travel website is open for reservations 24 hours a day, and Amie regularly checks the website for the waiting time to maintain consistency in service. She uses the following independently drawn samples of wait time during two peak hours, morning 8 a.m. to 10 a.m. and evening 7 p.m. to 9 p.m., for the analysis. Assume that wait times are normally distributed. Wait Time (in seconds) Morning hours 8 a.m. to 10 a.m. 97 101 115 107 129 98 96 132 118 104 123 128 95 127 112 Evening hours 7 p.m. to 9 p.m. 95 92 89 90 102 96 85 81 84 100 97 80 98 79 99 A 90% confidence interval is found to be [1.19, 7.36], where the morning is the first group and the evening is the second group. Which of the following is the correct conclusion? Multiple Choice We can conclude the…
1. Find the minimum sample size (n) you use to so that p is within a margin of error of 3% with a 95% confidence level when p ̂ and q ̂ are unknown.
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Anita's, a fast-food chain specializing in hot dogs and garlic fries, keeps track of the proportion of its customers who decide to eat in the restaurant (as opposed to ordering the food "to go") so it can make decisions regarding the possible construction of in-store play areas, the attendance of its mascot Sammy at the franchise locations, and so on. Anita's reports that 45% of its customers order their food to go. Suppose that this proportion is correct and that a random sample of 50 individual customers is taken. Answer the following. (a) Estimate the number of customers in the sample who order their food to go by giving the mean of the relevant distribution (that is, the expectation of the relevant random variable). Do not round your response. (b) Quantify the uncertainty of your estimate by giving the standard deviation of the distribution. Round your response to at least three decimal places.

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