You may need to use the appropriate appendix table or technology to answer this question. In a survey, the planning value for the population proportion is  p* = 0.31.  How large a sample should be taken to provide a 95% confidence interval with a margin of error of 0.05? (Round your answer up to nearest whole number.)

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Q: Identify the t -scores for a 90% confidence interval if the sample size is 25?

A: Givensample size(z)=25α=1-0.90=0.10α2=0.05

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

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Q: If we want a 95% confidence interval for proportion within 3% how large a sample do we need?

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

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A: Confidence interval : Confidence interval is a range of values it contains the true population…

Q: If a sample is used to estimate a population proportion p. What is the 80% confidence interval for…

A: Given  If a sample is used to estimate a population proportion p. What is the 80% confidence…

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A: #If an interval estimate is said to be constructed at the 90% confidence level, then confidence…

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Q: What is meant by saying that a 1-a confidence interval is a. exact?b. approximately correct?

A: a.Confidence Interval:Confidence interval is the interval estimate of the population parameter. It…

Q: Kim wants to determine a 80 percent confidence interval for the true proportion of high school…

A: Given: Margin of error, E=0.04 Confidence level=80%

Q: Other than the typical 90%, 95% and 99% confidence intervals, we may want to work with any other…

A: Note: This critical value calculated from standard normal distribution table at level of…

Q: For a research, let's consider the 10-unit sample with s = 32,866 as a preliminary example. For a…

A: Given data,s=32866E=10z-value at 95% confidence is Zc=1.96n=?

Q: Given a sample size of 400 with a mean of 80 and the population standard deviation is found to be 35…

A: We have given that,  Sample mean (x̄) = 80, population standard deviation (σ) = 35 and sample size…

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A: The random variable flu follows binomial distribution. X ~ B (n, p). The sample size is 337. The…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: If both the expected number of success and expected number of failures are greater or equal to 10,…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: Given data isn=332x=36p^=xn=36332=0.108434Margin og error(E)=0.04Confidence level=95%

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

A:

Q: Find the critical value v a/2 that corresponds to the given confidence level 87% ?

A: Given Confidence level 87%

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A: Hi! Thank you for posting the question. Since your question has more than three sub-parts, we have…

Q: Among the 34,506 people who​ responded, 63​% answered​ "yes."   Use the sample data to construct a…

A: Given data: Total number of people who responded for the question presented by online site, n =…

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: We have calculated a 95% confidence interval and would prefer for our next confidence interval to…

A: The next confidence interval can have a smaller margin of error by increasing the sample size. That…

Q: What should your sample size be if you want a confidence level of 90 percent and a margin of error…

A: We want to find the sample size (n)

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A: GivenThe true proportion p=0.01Let the sample size be n.The Z critical value for 90% confidence…

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A: Proportion = p =40/334 = 0.119760479041916 Margin of Error = E = 0.04 Confidence Level = 95…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A:

Q: Suppose you would like to conduct a survey to determine the yearly consumption of beef by a typical…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: If we wanted to reduce the margin of error to 3.5 per cent, how big would our sample ze have to be…

A: We have given that,  Margin of error (E) = 3.5% = 0.035 and confidence level = 95% = 0.95 Then,  We…

Q: This can be computed by adding and subtracting a margin of error to the point estimate.

A: The margin of error is obtained by multiplying the critical value and standard error value.

Q: Is this correct or incorrect? Why? A 95% confidence interval is always preferable over a 90%…

A: Given:    A 95% confidence interval is always preferable over a 90% confidence interval because a…

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and the potential…

A: The known values are, The sample proportion is, Critical values: Using the z-table, the critical…

Q: In general, how does doubling the sample size change the confidence interval size? (A) Doubles the…

A: When the sample size doubles, then the confidence interval size(width) change divides the interval…

Q: if you increase the sample size and confidence level at the same time. what will happen to the width…

A: The formula for the confidence interval (say) for population mean is :  C.I= x ± zα/2.s2n As the…

Q: A computer store near campus is stocking its shelves, and wants to know the relative proportions of…

A: Given that 95% confidence interval is (0.4241, 0.6759)

Q: In a survey, the planning value for the population proportion is p*=0.25 . How large a sample should…

A: It is given that, the population proportion is p*=0.25. The level of confidence is 95% level. The…

Q: required, round your answers to two decimal places. Provide a 90% confidence interval for the…

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Q: When finding confidence intervals for one population mean, if you want a 95% confidence interval,…

A: A critical value is the number on the borderline separating sample statistics that are likely to…

Q: According to Thomson Financial, last year the majority of companies reporting profits had beaten…

A: Given data,Beat estimates =114Matched estimates =29Fell short =19Total =162

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

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Q: It is known that the population range equals 60. With a 95% confidence level, the sample size that…

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Q: When computing a confidence interval, the size of the error term depends on what?

A: The formula to calculate the error term for confidence interval is as follow:

Q: According to Thomson Financial, last year the majority of companies reporting profits had beaten…

A: Given data,Total number of companies n=162best estimates=114Matched estimates =29Fell short=19

Q: 2. You are going to construct a 90% confidence interval for the proportion of adults that have a…

A: From the given information, let X be the number of adults that have a post-secondary education. The…

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

A: It is given that the margin of error (E) is 0.49.

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

A: a) Given, Margin error (E) = 0.09 Assume sample proportion = 0.5   The objective is to find the…

Q: What effect does increasing the sample size have on the length of a Confidence Interval (CI)?…

A: The confidence interval depends on the three factors: Confidence level: The width of the confidence…

Q: What would be the standard error in computing a confidence interval for the difference of…

A: It is given that For population 1, sample size n1 = 49, sample proportion = 0.682 For population 2,…

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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.