Suppose that a garage finds that 42 customers of 142 customers samples get their oil changes on time. Find a 98% confidence interval of the true proportion. What is the lower bound of the confidence interval? (round to 4 decimal places)

Q: A researcher found a 95% confidence interval for the proportion of college students who believe in…

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Q: I've asked 91 students on Monday whether they did their homework over the weekend. 20 of them said…

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Q: Suppose we know that a confidence interval is (-.735, .125). Find the sample mean and the error…

A: Ans- Given,     a confidence interval is (-.735, .125). Find  the sample mean and the error bound.

Q: A survey reveals that 12% of Americans believe Elvis is still alive, with a margin of error of 4…

A: Given: A survey reveals that 12% of Americans believe Elvis is still alive. A margin of error is 4…

Q: Suppose we know that a confidence interval is (27,35), with a margin of error of 4. Find the sample…

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Q: All else equal, an increase in sample size will cause a(n) decrease increase in the size of a…

A: Solution : All else equal, an increase in sample size will cause a decrease in the size of a…

Q: A poll reported that only 507 out of a total of 1809 adults in a particular region said they had a​…

A: The sampled no. of adults, i.e., the sample size, n=1809. The no. of sampled adults who expressed a…

Q: A study found that for a sample of cars traveling on Interstate 70, the average speed was 70 mph…

A: We have to find margin of error.

Q: A survey of 200 Internet users shows that they spend an average of 2 hours and 22 minutes per day on…

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Q: In a random sample of 500 Americans, 25% indicated that they have a cat for a pet. Estimate with 97%…

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Q: In a random sample of 500 Americans, 50% indicated that they have a cat for a pet. Estimate with 95%…

A: Given information

Q: A random sample of 100 employees at a company shows that 62 are female.  Form a 95% confidence…

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Q: You want to get a 95% confidence interval for the difference between the percentage of females with…

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Q: A researcher takes a sample of 25 people and calculates a 90% confidence interval of (4,24) for a…

A: The confidence interval is (4,24).

Q: If n = 460 and p (p-hat) = 0.6, construct a 90% confidence interval. Give your answers to three…

A: Given:

Q: confidence interval for a population mean is (56,78), with a margin of error of 11. What is the…

A: From provided information, Confidence interval for population mean is (56, 78), with margin of error…

Q: The National Center for Education Statistics reported that 47% of college students work to pay for…

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Q: Construct a 92% confidence interval if x=100 and n=400. Round your answers to 3 decimal places

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

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Q: Suppose that a garage finds that 30 customers of 138 customers samples get their oil changes on…

A: The objective of this question is to find the upper bound of the 98% confidence interval for the…

Q: Find a Confidence interval for the true Population Proportions if n = 30,        x = 75, and the…

A: From the given information, X=75 and n=30.

Q: Construct a 90% confidence interval for the mean when x̅=50 and there are 31 observations. Suppose…

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Q: An 80% confidence interval is found to be (12,20). What is the margin of error

A: From the provided information, Confidence interval is (12, 20). Confidence level = 80%

Q: A random sample of 100 employees at a company shows that 62 are female.  Form a 90% confidence…

A: Given: x=62n=100p^, sample proportion=xn=0.62

Q: In survey of 7000 women, 4431 says they change their nail polish once a week. Construct a 95%…

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Q: Construct a 96% confidence interval if x=75 and n=200. Round your answers to 3 decimal places.

A: Introduction: The 100 (1 – α) % confidence interval for the population proportion, p is: Here, n is…

Q: If n=500 and X = 400, construct a 90% confidence interval. Give your answers to three decimals <…

A: Given X=400 n=500

Q: You want to get a 90% confidence interval for the difference between the percentage of females with…

A: Obtain the 90% confidence interval for the difference between proportions   The 90% confidence…

Q: If n=140 and X = 112, construct a 90% confidence interval. Give your answers to three decimals  <…

A: From the available information, n=140 and x=112. The sample proportion is, The confidence level is,…

Q: Which of the following will increase the size of a confidence interval? Increasing sample size.…

A: Here we have to identity which of the following option increase the size of confidence interval

Q: Find z* for a confidence level of 83%. Give your answer to 3 decimal places.

A: We have to find z* for a confidence level of 83%

Q: a survey of 3080 ​adults, 1471 say they have started paying bills online in the last year.…

A: Given that, n=3080, x=1471 sample propotion p=xn=14713080=0.4776 The 99% confidence interval for the…

Q: Fall2020 Score Spring2021 Score Options vars 47 48.5 46 47.5 Two sample T confidence interval: H :…

A: The sample statistic is provided as follows.              Sample n Mean Std. dev.…

Q: From a sample of 500 Pepperdine students, 205 said they commuted to school. Find the 95% confidence…

A: We have given that,  Favorable cases (X) = 205 and sample size     (n) = 500  Then,  We will find…

Q: If n=230 and p (p-hat) = 0.61, construct a 95% confidence interval. Give your answers to three…

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