A member of the city government thinks that 90 percent confidence isn't enough. He wants to be 99 percent confident. How would the margin of error of a 99 percent confidence interval based on the same sample compare with the 90 percent interval found in the previous question?

Q: we have a 95% confidence interval for some parameter. If we were to increase the confidence , say to…

A: If increases the confidence level then what happened in width of C.I.

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

A: An outlier in a data set is a value that is significantly large or small compared to the other…

Q: How to Construct a 99% confidence interval for the true proportion of all workers who believe that…

A: It is given that the sample size (n) is 130 and x is 100.

Q: Variety magazine recently ask a random sample of readers if Disney Plus was "as good as" Netflix.…

A: The 90% confidence interval is [0.4575, 0.5225]

Q: A researcher wants to learn the ratio of smoking habit among the university students. Out of 1000…

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Q: A new fertilizer was applied to the soil of 276 bean plants. 24% showed increased growth. Find the…

A: Given Data: p=0.24 n=276   z-value corresponding to 95% Confidence level=1.96

Q: What is the likelihood that a 90% confidence interval will not cover the true population value?…

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Q: survey company published results of a survey stating that 56% of the 600 randomly sampled residents…

A: Given that  A survey company published results of a survey stating that 56% of the 600 randomly…

Q: A random sample of 328 medical doctors showed that 171 have a solo practice (Source: Practice…

A: (a) The point estimate of p is p^ obtained as below: p^=xn=171328=0.5213 Thus, the point estimate of…

Q: Jane wants to estimate the proportion of 13 students on her campus 4 who eat cauliflower. After…

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Q: Relative risk is defined to be the ratio of success proportions between two groups. Suppose that a…

A: It is given asThe 95% confidence interval for relative risk is:CI = ( 1.32, 2.62 )

Q: Suppose a random sample of 50 basketball players showed the average height to be 78 inches. Also,…

A: From the provided information, Population standard deviation (σ) = 1.5 Sample mean (x̄) = 78 Sample…

Q: If n=240 and X = 192, construct a 90% confidence interval. Enter your answer as an open-interval…

A: 1. The given values are n=240,x=192. The proportion of x is, p^=xn=192240=0.8 Computation of…

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: 16) So, Elizabeth is working through school right now and she is planning on being an attorney. She…

A: 16)   It is given that, p hat is 0.56 and n is 1,000.

Q: Two different simple random samples are drawn from two different populations. The first sample…

A: Given: Sample size of first is n1=20. Number of people have same attribute is x1=9. Estimated sample…

Q: If n=280 and X = 224, to construct a 95% confidence interval, you need to use which one of the…

A: Given X=224, n=280, level of significance ɑ=0.05

Q: when does an inferential statistics problem involve either a confidence interval estimate or a…

A: Hypothesis test- It is used to test the hypothesized population mean with respect to the sample…

Q: Use the data from this survey to construct a 91% confidence interval estimate of the proportion of…

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Q: how you recognize when an inferential statistics problem involves either a confidence interval…

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Q: 5. Asample of 350 engineering applicant included 140 women. Find the 95% confidence interval of the…

A: Given: Sample size, n=350 No. of women, x=140

Q: Find the critical values X1-α/2 and x for a 90% confidence level and a sample size of n = 15. x/2…

A: The confidence level is 90% and the sample size is 15.

Q: psychologist would like to estimate the proportion of Americans that say "the future of the nation…

A: It is given that the sample size (n) is 917 and the sample proportion is 0.732.

Q: was the percentage of adults who used social media five years ago. Of the 2703 people who responded…

A: (a) The sample proportion is: p= x/n=1758/2703 =0.65 The value of z at 92% confidence level is 1/75,…

Q: When the results of a survey or a poll are published, the sample size is usually given, as well as…

A: a)   Given that the point estimate is 78% and the margin of error is ≠3%.   Therefore, the…

Q: 6. The hospital would also like to estimate the Blue Shield as their insurance provider. A ra used…

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Q: The results of a survey found that people were more likely to enjoy coffee with cream if they lived…

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Q: T 60. Yogurt Consumer Reports tested 11 brands of vanilla yogurt and found these numbers of calories…

A: Here we need to find a 95% confidence interval.

Q: The mileage a car got on 5 trips from Greenwood to Greenville was used to create a 90% confidence…

A: Solution Given that 90% confidence interval is​ (32.32, 38.32).