3) A local municipality tests 25 samples of water and finds that the mean concentration of chlorine in the water is 150 mg/l with a standard deviation of 18 mg/l. Construct a 90% confidence interval for your results and draw the interval.

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Q: Suppose a sample of 30 Statistics students are given an IQ test. If the sample has a standard…

A: Given n=30, sample standard deviations s=12.23

Q: If n=510 and ˆpp^ (p-hat) =0.19, find the margin of error at a 90% confidence level Give your…

A:

Q: What is the talpha/2 value to use for calculating a confidence interval from a sample of size 45…

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Q: If a school district takes a random sample of 63 Math SAT scores and finds that the average is 488,…

A: Given information Sample size (n) = 63 Sample mean x̅ = 488 Population standard deviation σ = 100…

Q: If n=520 and p (p-hat) =0.47, find the margin of error at a 90% confidence level Give your answer to…

A: Given data,n=520p=0.47z-value at 90% confidence is Zc=1.645Margin of error(E)=?

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift results…

A:

Q: If a school district takes a random sample of 53 Math SAT scores and finds that the average is 488,…

A: Given Information: Sample size n=53 Sample mean x¯=488 Population standard deviation σ=100

Q: Generate a 95% confidence interval estimate of the true BMI

A: The descriptive analysis is conducted using EXCEL. The software procedure is given below: Enter the…

Q: Find the value of ta for a 99% confidence interval when sample size is 30 2

A: Note: Since you have asked multiple question, we will solve the first question for you as per…

Q: In an effort to estimate the mean amount spent per customer for dinner at a major Atlanta…

A: From the provided information, Sample size (n) = 49 Sample mean (x̅) = $24.80 Population standard…

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A:

Q: If a 0.10 significance level is to be used to test the claim that  p 1 less thanp 2​, what…

A: Provided that the level of significance is α=0.10.  Let p1 and p2 denote the population proportion…

Q: 6. A food snack manufacturer samples 7 bags of pretzels off the assembly line and weighs their…

A: The confidence interval measure the range where the true population parameter exist. If the…

Q: Based on a sample of approximately 600 nonsmokers and 200 smokers, estimate the true difference…

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Q: Determine the margin of error for the confidence interval for the mean: 21+1.2 The margin of error…

A: Confidence Interval formula for mean is given by, => (X bar + - z* sigma/√n) Where X bar is mean.…

Q: Determine the sample size necessary to construct a 85% confidence interval with an error of 0.07 if…

A: Given,margin of error (E)=0.07sample proportion…

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A: It is given that the mean is 433 and the population standard deviation is 100.

Q: If you think a data point is an outlier, what test can you perform to see if you should omit the…

A: Given that the number of data points in the set is 8.

Q: Construct a 90​% confidence interval for the population standard deviation σ at Bank B.

A: The descriptive analysis is conducted using EXCEL. The software procedure is given below: Enter the…

Q: Construct the appropriate confidence interval for the given level of significance.

A: The table given below ,  before(x) after(y) di=x-y di^2 66 72 -6 36 71 78 -7 49 60 60 0 0…

Q: Suppose you are planning to construct a 23% confidence interval for a one sample population…

A: We have given that confidence level (c) = 23% = 0.23

Q: In a survey, 19 people were asked how much they spent on their child's last birthday gift. The…

A: From the provided information, Sample size (n) = 19 Sample mean (x̄) = $46 Sample standard deviation…

Q: construct a confidence interval at a 80% confidence level. stributed population.

A: Given : n=15 , X-bar=45  , s=5  , α=0.20 Here , we want to find the 80% confidence interval for the…

Q: Suppose our estimate for the mean score for the Player A group was 48 ± 5% SE (standard error). What…

A: Given: Point estimate = 48 Standard error = 5 Confidence level = 95%

Q: If a school district takes a random sample of 89 Math SAT scores and finds that the average is 494,…

A:

Q: 5, Randomly selected middle-aged people in both China and the United States were asked if they…

A: For China, n =1300 and x = 1170 therefore p^1 =11701300 = 0.9 For USA,  n = 150 and x =110 p^2…

Q: Determine the sample size necessary to construct a 95% confidence interval with an error of 0.08 if…

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Q: A doctor claims that the mean number of hours of sleep that seniors in high school get per night…

A: From the provided information, The claim is that the mean number of hours of sleep that seniors in…

Q: Suppose a drug for stomach discomfort is tested on 75 subjects, and the mean time for it to take…

A: Given: Sample size n = 75 Sample mean X = 200 Population standard deviation σ = 30 Formula Used:…

Q: We plan to sample parents in order to construct a 99% confidence interval for the proportion who…

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Q: Suppose you observe 62 data points from a distribution with standard deviation 2.1, and you…

A: Given, n=62 data points standard deviation SD= 2.1, calculated a 92% two-sided confidence interval…

Q: Suppose we would like to estimate the proportion of all NBA fans who thought Aaron Gordon won the…

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Q: Suppose a drug for stomach discomfort is tested on 50 subjects, and the mean time for it to take…

A: To find the confidence interval we will use z distribution because the population standard deviation…

Q: 1. How can you make a 95% confidence interval smaller without changing the confidence level?

A: Confidence interval is an interval such that the probability of the unknown parameter to be included…

Q: 2. Construct a 90%, 95%, and 99% confidence interval of the mean weight of fresh oranges if 100…

A: Given : Mean , μ = 180 gm Standard deviation, σ = 30 gm sample size, n = 100 a) Confidence Level =…

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift. The…

A: Given Sample mean=36 Standard deviation=15 Sample size=24

Q: Would it be reasonable to develop a confidence interval from these data to show the mean number of…

A: John is interested to know the number of hours children under 12 years if age watched TV per day.…

Q: Suppose you want to construct an 80% confidence interval for the proportion of businesses that…

A: Given:Margin of Error (E)=3.5%=0.035   For Confidence level 80%, the significance level (α) is…

Q: A bank wishes to estimate the mean balances owed by customers holding MasterCard. The population…

A: Determine the sample size n needed.   Obtain the critical value of z at the 98% confidence level.…

Q: If n=200 and ˆpp^ (p-hat) =0.16, find the margin of error at a 95% confidence level Give your…

A: Given Information

Q: An educator wants to construct a 99% confidence interval for the proportion of elementary school…

A: The random variable is elementary school children in Michigan who are proficient in reading. It…

Q: If a school district takes a random sample of 61 Math SAT scores and finds that the average is 466,…

A: Find a 99% confidence interval for the mean math SAT score for this district.

Q: What is the smallest sample size that guarantees that the margin of error is less than 3% when…

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Q: According to a report on sleep deprivation by the Centers for Disease Control and Prevention, the…

A: Given that  p^1=7.8%=0.078p^2=8.7%=0.087n1=11937n2=4892p^=n1p^1+n2p^2n1+n2=0.0806 Confidence…

Q: If a school district takes a random sample of 80 Math SAT scores and finds that the average is 442,…

A: Given that, Sample size n=80 Sample average x¯=442 Population standard deviation σ=100

Q: suppose that in sampling for the population proportion, it is found that 20 out of 100 items are…

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