A market researcher collects a simple random sample of customers from a population of over a million​ customers that use a home improvement website. After analyzing the​ sample, she states that she has​ 95% confidence that the mean​ time customers spent on​ that website per day is between 17 and 54 minutes. Suppose that the population mean​ time customers spent on that website is 14 minutes a day. Does this value of the population mean help to show that the confidence interval estimate is​ correct? Explain.

Q: 1a What is a confidence interval? 1b How does a confidence interval differ from a point estimate?

A: In the given problem, we need to write about  confidence interval & the difference between…

Q: Tourism is extremely important to the economy of Florida. Hotel occupancy is an often-reported…

A: given data  n1 =1750    x1 = 1470p^1 = x1n1 = 14701750 = 0.8400 n2 = 1800    x2 = 1458 p^2 = x2n2 =…

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A: Note: Hi there! Thank you for posting the question. As there are multiple sub parts, according to…

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A:

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A: Given information: Count = 711 Adult/Child Frequency Relative Frequency Adult 654 0.91983122…

Q: (b) Estimate the sample size needed if no estimate of p is available. A sample of elementary school…

A: From the provided information, Confidence level = 95% Margin of error = 0.06

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A: Given data,n=36x=540s=82α=0.05

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Q: Construct an 80% confidence interval to estimate the population mean using the data below. What…

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A: The table below shows the required calculation-   x y xy x2 y2   -2 -4 8 4 16   -1 0 0 1 0…

Q: Tourism is extremely important to the economy of Florida. Hotel occupancy is an often-reported…

A: given data  n1 =1750    x1 = 1470p^1 = x1n1 = 14701750 = 0.84 n2 = 1800    x2 = 1458 p^2 = x2n2 =…

Q: What is the upper bound of the confidence interval? A 98% confidence interval for the data: 25, 38,…

A: We have given data, X 25 38 62 45 61 38 21 42 31 35 The confidence level is 1-α=0.98.

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Q: How does the sample size and percentage of confidence influence the width of a confidence interval?

A: We have to define effect on width of C.I.

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A: Fol

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A: Lower bound=-5.400 Upeer bound =1.670

Q: "Calculating a confidence interval provides you with an indication of how reliable your sample mean…

A: The degree of confidence is the likelihood that the confidence interval will include the true mean…

Q: What does Level of Confidence indicates?

A:

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A: As the population standard deviation is known, we will use z distribution. The critical value z at…

Q: Time (min.) 78 70 73 79 68 136 72 60 50 8 61 72

A: Given, 78 70 73 79 68 136 72 60 50 8 61 72

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A: Given n1=n2=20 S1=1.5 S2=0.8

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A: As per guidelines we will solve first question only, please repost other questions for more answers.…

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Q: Z-score for an 88% confidence level

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A: n=26 x¯=98.7Standard deviation =43.9α=1-0.90=0.10

Q: Describe how a Confidence Interval might be a better piece of information to report from a study…

A: Confidence intervals provide information about a range in which the true value lies with a certain…