Solve the problem. What is the confidence level of the following confidence interval for u? x ± 2.33 O 67% O 78% O 98% O 233%
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- Construct the confidence interval for the population mean u. c= 0.98, x= 4.2, o = 0.6, and n= 57 A 98% confidence interval for is | D. (Round to two decimal places as needed.)Solve the problem. Fifteen SmartCars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per gallon. Which of the following would represent a 90% confidence interval for the average highway mileage of all SmartCars? O 47 ± 1.345- O 47 + 1.761- V15 O 47 + 1.645- 15 O 47 + 1.753-5 47 ± NextShown below is the confidence interval (CI) for the difference, µ, - H2, between two population means. Interpret the confidence interval. 90% Cl is from 20 to 30 Choose the correct answer below. O A. It can be said, with 90% confidence, that there is no significant difference between the value of Hj and the value of lz. Note that this means the difference between the two means may be zero O B. It can be said, with 90% confidence, that the value of u, is somewhere between 20 and 30 less than the value of h. Note that this means the difference between the two means is less than zero. O c. It can be said, with 90% confidence, that the value of u, is somewhere between 20 and 30 greater than the value of µ. Note that this means the difference between the two means is greater than zero O D. The true value of l, - H, lies somewhere between 20 and 30. Note that this means the difference between the two means is greater than zero.
- A 95% confidence interval for the mean (u) of a population is computed from a random sample and found to be 9 ± 3. Which of the following is a correct statement? O a. if we took many, many additional random samples and from each computed a 95% confidence interval for H, approximately 95% of these intervals would contain u. O b. 95% of values sampled are between 6 and 12. O c there is a 95% probability that the true mean is 9 and a 95% chance that the true margin of error is 3. O d. there is a 95% probability that u is between 6 and 12. O e. all of the above are true.Construct the confidence interval for the population mean u. c= 0.95, x= 6.1, o = 0.6, and n = 40 A 95% confidence interval for u is ( D. (Round to two decimal places as needed.)Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
- I need the right answers to this problem.If n=27, ¯x(x-bar)=36, and s=20, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place._____ < μ < _____Which interval is which? Alessandro constructed three confidence intervals, all from the same random sample. The confidence levels are 90%, 95%. and 99%. The confidence intervals are I. 4.5<µ<5.5 II. 4.3 <µ<5.7 III. 4.6<µ<5.4 Unfortunately, Alessandro has forgotten which confidence interval has which level. Match each confidence interval with its level. 4.5Which interval is which? Alessandro constructed three confidence intervals, all from the same random sample. The confidence levels are 90%, 95%, and 99%. The confidence intervals are I. 7.4<μ<8.6 II. 7.1Use the sample information. X = 40, 0 = 4, and n= 20 to calculate the following confidence intervals assuming the sample is from a normal population. A. 90% confidence from____to____ (Round 4 decimal places.) B. 95% confidence interval is from_____to_____ (Round 4 decimal places.) C. 99% confidence interval is from______to_____ (Round 4 decimal places.) D. Describe how the intervals change as you increase the confidence level. A. The interval gets narrower as the confidence level increases B. The interval gets wider as a confidence level decreases C. The interval gets wider as a confidence level increases D. The interval stays the same as the confidence level increasesProvide an appropriate response. Suppose you have obtained a confidence interval for u, but wish to obtain a greater degree of precision. Which of the following would result in a narrower confidence interval? L Increasing the sample size while keeping the confidence level fixed II. Decreasing the sample size while keeping the confidence level fixed III. Increasing the confidence level while keeping the sample size fixed IV. Decreasing the confidence level while keeping the sample size fixed O A. , IV O B. I, II OC. II, IV O D. II, II O E. II, IVSEE MORE QUESTIONSRecommended textbooks for youMATLAB: An Introduction with ApplicationsStatisticsISBN:9781119256830Author:Amos GilatPublisher:John Wiley & Sons Inc
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