In a survey of 3250 adults, 1448 say they have started paying bills online in the last year. (a) Construct a 99% confidence interval for the population proportion. (b) Interpret the results. Click here to view an example for constructing a confidence interval for the population proportion Click here to watch a tutorial on how to use the Show Work window features.

Q: Find the critical value for the population mean if there are 756 cats in a sample and you want a 91%…

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Q: Can you please calculate the 95% confidence interval for this problem

A: From the obtained results, the mean of the difference is -2.1 and the standard deviation of the…

Q: 37% from a sample of 3800 people are saving for retirement. Construct the confidence interval for…

A: Given that.  Sample size n =3800 Sample proportion p^=37%=0.37

Q: A sample of 60 people who were chosen for a sample had an average IQ score of 105. If the population…

A: From the given, x¯ (mean IQ score from sample)=105n (sample size)=60σ (population SD of IQ…

Q: When 99% confidence interval is calculated instead of a 95% confidence interval with the same sample…

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Q: A sociologist wants to construct a 94% confidence interval for the proportion of teenagers who uses…

A: Given, p=0.23 E=0.02 z value at 94% confidence is Zc=1.88 n=?

Q: Find the critical t value to use in making a 99% confidence interval for a mean if the sample size…

A: Solution-: Given: n=7,α=0.01 We find the critical t- value to use in making a 99% C.I. for a mean

Q: The mean hours of worked for United Airlines pilots is 46 hours/month based upon a sample of 25…

A: Given: Sample size, n=25 Sample mean, X=46 hours Sample standard deviation, s=3 hours The level of…

Q: What is a Confidence Level? what is one example of the use of the Confidence Interval?

A: A level of confidence refers to the percentage of all possible samples which the true population…

Q: When calculating the confidence interval for a population mean, which distribution is used?

A: Confidence interval for mean: When the sample size is large (n>30) and population variance (or…

Q: The relationship between confidence interval and hypothesis testing is very close. Do you agree?…

A: Yes, the relationship between confidence interval and hypothesis testing is very close. Generally,…

Q: Find a credible journal article or website where confidence intervals were used to make informed…

A: From the given information we find the solution.

Q: Generally speaking, what is the difference between a confidence interval and a prediction

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Q: (b) Assume that the mean score for students taking traditional courses is 5.60. A college that…

A: The mean score for students taking traditional curses is 5.60.

Q: Suppose 250 randomly selected people are surveyed to determine if they own a tablet. Of the 250…

A: According to the given information,Sample size, n = 250Number of successes, x = 98Confidence level,…

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.

Q: Find the critical t value to use in making a 98% confidence interval for a mean if the sample size…

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Q: margin of error for a 95% confidence interval is approximately 2 times the standard error.  True…

A: The standard error can be calculated as: SE=σnorSE=sn Here, σ  or s = Standard deviation n = Sample…

Q: If n = 330 and X = 264, construct a 95% confidence interval for the population proportion, p.

A: Ans#- From the provided information, Confidence level = 95% Sample size (n) = 330, x = 264 Sample…

Q: If n=540 and (p-hat) = 0.13, construct a 99% confidence interval. Give your answers to three…

A: We have given that,  Sample size (n) = 540  Sample proportion (p-hat) = 0.13 Then,  We will find the…

Q: oning in

A: To determine if the confidence interval supports the claim, check if the claimed population…

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?

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Q: If n=120 and p (p-hat) =0.31, find the margin of error at a 99% confidence level Give your answer to…

A: Sample size, n = 120 p^ = 0.31 99% confidence level

Q: Identify the y-score for a 99% confidence interval if the sample size is 35.

A: We have to find critical value for given data..

Q: Explain when you would use the z value or the t-value to calculate a confidence interval

A: Z value: The z value is used for finding the confidence intervals for single population proportion,…

Q: What is the 95% confidence interval for the slope? The table contains a random sample of seven…

A: The table contains a random sample of seven skyscrapers in Chicago. Let x=number of stories And…

Q: I need help with creating a confidence interval using gender as a healthcare variable

A: Here, we can can use the sample proportions relating to a particular gender type to find the effect…

Q: Suppose we take a survey of 400 students and ask how much they study per week. The result is an…

A: The 100 (1 – α)% confidence interval provides an interval estimation of the required population…

Q: Find 95% confidence interval for the population mean, if the sample size is 40, the sample mean is…

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Q: magine that you conduct a study and estimate that the prevalence of hypertension among employees of…

A: From the provided information, Sample proportion (p̂) = 0.24 Margin of error for a 95% confidence…

Q: A recent study by the McGraw-Hill company showed that 61% (1621) of college students use their…

A: Given, Proportion of college students use their smartphones for study = 0.61Total number of students…

Q: Here are some ratings on a scale of 1-10. Use confidence interval of 99% confidence. What is the…

A: Given data, 8, 7, 3, 10, 4, 4, 8, 8, 7, 8, 3, 8 n=12 Sample mean and sd is x=6.5 s=2.35

Q: A psychologist asked a random sample to complete a depression questionnaire. On average, children…

A: The 95% confidence interval for the population mean depression score of children, will signify that,…

Q: What is the effect on a confidence interval if one decreases both sample size and the level of…

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Q: List below are the speeds (mi/h) measured from the southbound traffic on I-280, the speed limit is…

A: Given data is62,61,61,57,61,54,59,58,59,69,60,67

Q: Can you please write B up in writing as it is incorrect but I think it's because it's been converted…

A: f(x) = 3(x-1)^2, 0<x<1

Q: Given this data: {4, 5, 8, 11, 16, 8}, (a) Find the 90% confidence interval for the mean. (b)…

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.