Suppose a random sample of 85 items has been taken from a population and 34 of the items contain the characteristic of interest. a. Use this information to calculate a 90% confidence interval to estimate the proportion of the population that has the characteristic of interest. b. Calculate a 95% confidence interval. c. Calculate a 99% confidence interval. d. As the level of confidence changes and the other sample information stays constant, what happens to the confidence interval?

Q: If your sample mean is 56.2, with an upper limit to your confidence interval of 59.94, what is the…

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Q: If n=19, x(x-bar)=32, and s=3, construct a confidence interval at a 90% confidence level. Assume the…

A: Mean = 32 Standard deviation = 3 Sample size = 19

Q: A 95 percent confidence interval of the form p̂ ± E will be used to obtain an estimate for an…

A:

Q: Construct the confidence interval for the population mean.   c=0.98 x overbar= 8.1 σ=0.5 and n=44…

A: given that,population standard deviation, σ =0.5sample mean, x =8.1size (n)=44

Q: If n=28, x¯(x-bar)=49, and s=4, construct a confidence interval at a 80% confidence level. Assume…

A: Given: Sample size (n) = 28 Sample mean (x̅) = 49 Standard deviation (s) = 4 Confidence level = 80%…

Q: A If n=21, ¯x (x-bar)=34, and s=8, construct a confidence interval at a 98% confidence level. Assume…

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Q: If n 19, x =40, and s = 20, construct a confidence interval at a 80% confidence level.

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Q: If n=13, ¯x(x-bar)=36, and s=10, construct a confidence interval at a 80% confidence level. Assume…

A: Solution: From the given information, n=13, x-bar=36 and s=10. The confidence level is 0.80.

Q: Determine the margin of error for a confidence interval to estimate the population mean with n = 21…

A: n = 21  s​ = 12.6 confidence interval = 80%.

Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Q: If n=19, ¯xx¯(x-bar)=37, and s=13, construct a confidence interval at a 99% confidence level. Assume…

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Q: If n=12, =49, and s=8, construct a confidence interval at a 80% confidence level. Assume the data…

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Q: n=31, ¯xx¯(x-bar)=30, and s=5, construct a confidence interval at a 98% confidence level. Assume the…

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Q: If n=15, ¯x (x-bar)=48, and s=4, construct a confidence interval at a 80% confidence level. Assume…

A: Since the population standard deviation is unknown, t distribution can be used for the computation…

Q: Construct the 94% confidence interval estimate of the population proportion ? if the sample size is…

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Q: If n=24, ¯xx¯(x-bar)=49, and s=9, construct a confidence interval at a 80% confidence level. Assume…

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Q: The figure to the right shows the results of a survey in which 1003 adults from Country A, 1024…

A: Given information For country A p-hat = 0.35 n = 1003

Q: Suppose a researcher found that M= 30.00 and SEM= 3.00. What are the limits of the 68% confidence…

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Q: If n = 32, x¯(x-bar)=  37, and s = 8, construct a confidence interval at a 90% confidence level.…

A: Given data, n=32 x bar =37 s=8 α=0.10

Q: If n=320 and ˆpp^ (p-hat) =0.26, find the margin of error at a 95% confidence level

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Q: m. Assuming someone's attendance is 75%, what overall course grade would you expect them to have? n.…

A: The study is interested in determining if attendance affects a student's overall course grade.

Q: If n = 16, ¯xx¯ = 32, and s = 10, construct a confidence interval at a 80% confidence level. Assume…

A: We have given that,  Sample mean (x̄) = 32, sample size (n) = 16 and standard deviation (s) = 10…

Q: If you obtained one thousand 95% confidence intervals for a population mean, µ, roughly how m the…

A: f you obtained one thousand 95% confidence intervals for a population mean, roughly it contains…

Q: Given the following confidence interval for a population mean, compute the margin of error, E.…

A: A confidence interval of population mean, µ, in terms of sample mean and margin of error, can be…

Q: If n=n= 22, x= 32, and s= 16, construct a confidence interval at a 99% confidence level. Assume the…

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Q: If n=26, ¯xx¯(x-bar)=31, and s=17, construct a confidence interval at a 98% confidence level. Assume…

A: From the provided information, Sample size (n) = 26 Sample mean (x̅) = 31 Sample standard deviation…

Q: If n=20, (x-bar)=47, and s=15, construct a confidence interval at a 99% confidence level. Assume the…

A: The sample size is 20, sample mean is 47, and sample standard deviation is 15. The degrees of…

Q: Elly and Drew work together to collect data to estimate the percentage of their classmates who own a…

A: Given that Elly and Drew work together to collect the data to estimate the percentage of their…

Q: If n=200 and ˆpp^ (p-hat) =0.39, find the margin of error at a 99% confidence level

A: Find z-critical value:…

Q: If n=25, 7(x-bar)=36, and s=7, construct a confidence interval at a 80% confidence level. Assume the…

A: Question 7: Let μ is defined as the population mean. The sample size is 25, sample mean is 36, and…

Q: Select the correct response. a) Given the same sample data, the margin of error in a 90% confidence…

A: a) Given the same sample data, the margin of error in a 90% confidence interval would be smaller…

Q: Given the information: the sampled population is normally distributed, X– = 36.5, σ = 3, and n = 20.…

A: Given that

Q: The following small data set represents a simple random sample from a normally distributed…

A: a. The point estimate of is, Thus, the point estimate of is 50.25.

Q: In a harvest of 50 watermelons, farmers prefer at least 72% of watermelons to be classified as…

A:

Q: If n=27, x(x-bar)=40, and s=14, construct a confidence interval at a 98% confidence level. Assume…

A: Question is solved.

Q: In a certain high school, 7 out of 11 juniors said that they planned to go to the winter prom.…

A:

Q: If n = 20, ¯xx¯ = 47, and s = 9, construct a confidence interval at a 90% confidence level. Assume…

A: The degrees of freedom is, df=n-1=20-1=19 The degrees of freedom is 19. Computation of critical…

Q: The figure to the right shows the results of a survey in which 996 adults from Country A, 1006…

A:

Q: In a situation where the sample size was decreased from 39 to 29, what would be the impact on the…

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

Q: At one large college, 1867 out of the 2500 students surveyed said they plan to take another science…

A: The known values are, p^=1,867/2,500=0.7468, n=2,500. Using standard normal table, the critical…

Q: a. What should the sample size be for a 98% confidence interval for p to have a margin of error of…

A: Given: σ=17.40

Q: If n = 20, ¯xx¯ = 47, and s = 10, construct a confidence interval at a 80% confidence level. Assume…

A:

Q: 15, ¯xx¯(x-bar)=39, and s=11, construct a confidence interval at a 95% confidence level. Assume the…

A: Sample size (n) =15 Sample mean (x¯)=39 Sample standard deviation (s)=11 Confidence level (C)=95%…

Q: a) How large a sample is required to obtain a 95% confidence interval with a margin of error of 2…

A: Given that  Sample standard deviation s=7.5 But here i m using estimated standard deviation ?=7.5…

Q: If n=16, ¯xx¯(x-bar)=45, and s=17, construct a confidence interval at a 99% confidence level. Assume…

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Q: How many subjects would be needed to ensure that a 95% confidence interval estimate of BMI had a…

A: Given data set is28,21,37,38,24,28,38,47,27,32,36,43sample size(n)=12confidence level=95%Margin of…

Q: The manager of a car company will select a random sample of its customers to create a 90 percent…

A: From the provided information, Confidence level = 90% Margin of error = 0.06

Q: how many samples out of 100 would you expect to not include the true population mean within their…

A: here given ,  confidence level =  90%  sample size  = 100

Q: If n=25, ¤=30, and s=7, construct a confidence interval at a 98% confidence level. Assume the data…

A: It is given that sample mean is 30, sample size is 25 and the sample standard deviation is 7.

Q: In the construction of a confidence interval, if all other quantities are unchanged, an increase in…

A: Property of confidence interval: