Q24 Shamma computed a confidence interval for the mean pH level of bottled water in UAE based on a sample of 50 bottles. She forgot the confidence level she used but still remembers that the critical value she used was 2.861. Which confidence level has Shamma used? 99.6% 95% 90% 99%

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

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Q: A student reported a 95% confidence interval of [3.21,4.29] What is the mean of the data set?…

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Q: Heather runs a successful lawn-mowing business. She would like to estimate the true mean amount of…

A: We have given that  Sample size n =30 90% confidence interval . (40 , 55)

Q: A 95% confidence interval for a population mean was reported to be 134 to 142.  If the population…

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Q: If n = 180 and X = 144, construct a 90% confidence interval for the population proportion, p. Give…

A: Solution: From the given information, X=144, n=180 and the confidence level is 0.90. The sample…

Q: A study found the temperature of 125 randomly selected healthy adults averaged 98.25 F with a…

A: It is given that sample mean is 98.25 and standard deviation is 0.733.

Q: A 95% confidence interval was found to be (14.312, 21.432). What is the margin of error? ME=

A: Answer: From the given data, 95% confidence interval was found to be (14.312, 21.432) lower limit =…

Q: Pete kept records of the fuel efficiency of his car. After the first 100 times he filled up the…

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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: You sample 40 dogs and find a sample mean weight of 60 lbs with a sample standard deviation of 5.…

A: From the provided information, Sample size (n) = 40 Sample mean (x̅) = 60 lbs Sample standard…

Q: 60 people were asked to measure their pulse rates after completing a 3 km run. The mean was 105…

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Q: Use the given data to construct a confidence interval of the requested level. X = 178, N=531,…

A: Given : Sample Size, n = N = 531 Number of successes, x = 178

Q: Here are summary statistics for randomly selected weights of newborn girls: n = 250, x= 32.4 hg, s=…

A: The following information has been provided: The sample size is n=20. The sample mean is x¯=32.5.…

Q: A survey was conducted that asked 1016 people how many books they had read in the past year. Results…

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Q: If n = 15, the sample mean = 150, SD = 10, what is the confidence interval (using 99% confidence…

A: Given data,n=15x=150σ=10z-value at 99% confidence is Zc=2.576

Q: Noise levels at various area urban hospitals were measured in decibels. The mean noise level in  69…

A: We want to find 96% CI for population mean μ

Q: If n = 380 and X = 304, construct a 95% confidence interval for the population proportion, p. Give…

A: Given: n = 380 x = 304

Q: t has been determined with 95% confidence that the proportion of Americans who eat turkey on…

A: The 95% confidence that the proportion of Americans who eat turkey on Thanksgiving is between 0.78…

Q: Determine tc for n = 15 and a confidence level of 99%.

A: From the given information, Sample size (n) =15, Confidence level (1-α)= 0.99 Thus, the t-critical…

Q: Data of the weights of 81 pet dogs was collected. The sample mean was 30. The standard deviation is…

A: Here, T - interval is applicable ================= df = n-1

Q: If n = 220 and X = 176, construct a 95% confidence interval for the population proportion, p. Give…

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Q: Q1. A survey of 345 men showed that the mean time spent on daily grocery shopping is 15 mins. From…

A: Given: Sample size, n=345 Sample mean, x¯=15Population sd,σ=3Confidence level=98%

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

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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: (0.24, 0.56) is a confidence interval for the proportion of people who liked a new soda flavor.…

A: Made comparisons with confidence interval formula for proportion.

Q: Use the given data to construct a confidence interval of the requested level. x = 98, n = 223,…

A: Given information: x=98, n=223Confidence level=99% p^=xn=98223=0.4395 α2=1-0.992=0.005 Use the excel…

Q: find tc for a 95% confidence level when the sample size is 6.

A: level of significance, alpha = 0.05from standard normal table, two tailed t alpha/2 with n-1 = 6 d.f…

Q: Measuring the height of a California redwood tree is very difficult because these trees grow to…

A: 1.The 95% confidence interval estimate of the population slope between the height of the redwood…

Q: A survey of 30 adults found that the mean age of a person's vehicle is 3.6 years. Assuming the…

A: We have given that,  Sample mean (x̄) = 3.6, population standard deviation (σ) = 2 and sample size…

Q: The 95% confidence interval of the variance of a population is computed as (12.367,21.761).…

A: Given information: The 95% confidence interval for the variance of a population is (12.367, 21.761).…

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: Identify the t-score for a 99% confidence interval if the sample size is 70. t = The answer isnt…

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