Suppose that you wish to find a population proportion p with accuracy ±2% with 99% confidence. What sample size n would you recommend if p could be 0.5? What if the population proportion p can be assumed to be no larger than 0.40?

Q: A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What…

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Q: What does brand loyalty mean to consumers? According to a recent research report, 42% of consumers…

A: We have to find the sample size for the given margin of error and proportion.

Q: Suppose you have 67 samples with sample standard deviation 2.5. A 99% confidence interval for the…

A: The sample size n is 67.

Q: If you wish to estimate a population mean with a sampling distribution error SE = 0.28 using a 95%…

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Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Margin of Error(E)=0.05For 99% confidence level Zα2=2.576 Formula; E=Zα2×(p×(1-p)n)

Q: At 95% confidence, how large a sample should be taken to obtain a margin of error of .03 for the…

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

Q: We wish to know the 95% confidence interval for the population proportion of people who believe that…

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Q: We want to estimate a population proportion with a 95% confidence interval and we want the margin of…

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Q: Based on past data, it is known that about 20.5% of people smoke cigarettes. Suppose we take a…

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

Q: 50. Suppose a 90% confidence interval is stated as (0.3011, 0.4189). What is the sample proportion…

A: Given information- We have given a value of 90% confidence interval is- C.I = (0.3011, 0.4189) Lower…

Q: A sample of size n = 47 has a sample mean x = 58.2 and sample standard deviation s = 9.6 a) A 99.8%…

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Q: Determine sample size for the estimation of the population proportion E=0.024 95%confidence…

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Q: A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What…

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Q: Suppose you have 62 samples with sample standard deviation 4.4. A 99% confidence interval for the…

A: The confidence interval is an interval of estimating the unknown value of the population parameter,…

Q: Suppose you want to construct a confidence interval with a margin of error of 0.03 (3%). Find the…

A: The formula for calculating sample size is, n = z2*p^(1-p^)MOE2 Where, z is the z score (default…

Q: d. Suppose the ecologist ends up sampling n = 9 alligators and calculates a sample mean of =…

A: confidence interval calculation

Q: Find the minimum sample size you should use to assure that your estimate of p will be within a…

A: We have to find sample size required.

Q: 21. The estimate of the population proportion should be within plus or minus .05, with a 95% level…

A: α = 0.05 Zα2 = 1.96 Use Excel function=NORMSINV(0.025)

Q: Find the 98% confidence interval for the difference between the means of the two populations

A: Given that sample size n = 18 Mean difference = 22.9 And SD sd = 2.2 The critical value of t at (n -…

Q: A 95% confidence interval for a population mean was reported to be 152 to 160. If o = 16, what…

A: Given that the confidence interval for a population is 152 to 160. σ=16

Q: a. How large a sample should be selected so that the margin of error of estimate is 0.025 for a 98 %…

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Q: Find the sample size needed for a confidence interval about the population proportion if you want a…

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Q: A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What…

A: The random variable is adults who have​ high-speed Internet access. It follows standard normal…

Q: Suppose we wish to find the required sample size find a 90% confidence interval for the population…

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

A: GivenMargin of error(E)=0.04cofidence level(c)=80%assume population proportion (p)…

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

A: Given: Margin of error (E) = 2 Confidence level = 0.99 Therefore, α=1-0.99=0.01 Standard deviation…

Q: Consider a situation in which sampling without replacement is used to generate a random sample from…

A: In this case we need to identify the correct answer for the given question.

Q: What is the value of tα/2 for a sample of size n=39 at the 90% level of confidence?

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Q: Assume that a sample is being used to estimate a population mean μμ. If n = 29, x¯ = 46, and s =…

A: From the provided information, Sample size (n) = 29 Sample mean (x̅) = 46 Sample standard deviation…

Q: We want to determine the mean weight of a certain type of fish. If we also want to estimate u to…

A: Given that, Critical values: Using the z-table, the critical value at 95% confidence level for two…

Q: (d) Develop a 95% confidence interval for this population proportion. (Round your answer to four…

A: The point estimate of proportion of respondent who lack confidence they will be able to afford…

Q: Suppose you wanted to estimate the difference between two population means correct to within 4 at…

A: Given data, E=4 z-value at 91% confidence is Zc= 1.70 σ2=15.5σ=3.937n=?

Q: In each of parts (a)-(c), we have given a likely range for the observed value of a sample proportion…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What…

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Q: Nearly one half of americans aged 25 to 29 are unmarried.  How large a sample is necessary to…

A: The formula for the sample size is as follows:

Q: 3. What sample size is needed for to give the desired margin of error in estimating a population…

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Q: The graph below shows a 95% confidence interval for a population proportion that has been estimated…

A: 1. As the sample size increase the margin of error reduces As the margin of error reduces the…

Q: If a sample of size n = 25 is chosen from a normal population, which one of the following is a 95%…

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Q: If X=68​, σ=14​, and n=66​, construct a 95​% confidence interval estimate of the population​ mean, μ

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Q: what sample size should a researcher take if he wants to estimate a population proportion to be 2%…

A: From the given information,   Margin error = 0.02 Assume sample proportion = 0.5   Critical value:…

Q: r a situation in which sampling without replacement is used to generate a random sample from each of…

A: To calculate a confidence interval to estimate the difference between population proportions, both…

Q: A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What…

A: Given information:Margin of error (E) = 0.04Confidence level=90%…

Q: Step 1 Recall that for a 95% confidence level, the formula for the sample size n required to…

A: The true value of the population proportion p is unknown. To use the formula for sample size, we…

Q: Suppose we have a population that is approximately normal with standard deviation a=2.4 If we want…

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Q: What does brand loyalty mean to consumers? According to a recent research report, 37% of consumers…

A:

Q: A researcher wishes to estimate the proportion of adults who have​ high-speed Internet access. What…

A: Given information: Margin of error(E)=0.03. Confidence level= 90%. α=1-0.90  =0.10 Zα2=Z0.102…

Q: Set up the null and alternate hypotheses to test whether the population mean is equal to 10 when you…

A: The Null hypothesis is  Ho: μ=10

Q: If you wish to estimate a population mean with a sampling distribution error SE = 0.21 using a 95%…

A: