The formula used to calculate a confidence interval for the mean of a normal population when in is small is the following.(t critical value)What is the appropriate t critical value for each of the following confidence levels and sample sizes? (Round your answers to two decimal places.)LUSE SALT(a) 95% confidence, n = 17(b) 90% confidence, n = 11(c) 99% confidence, n = 24(d) 90% confidence, n = 25(e) 80% confidence, n = 13(f) 95% confidence, n = 9

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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ab K 21 You may need to use the appropriate appendix table or technology to answer this question. The makers of a soft drink want to identify the average age of its consumers. A sample of 52 consumers was taken. The average age in the sample was 24 years with a standard deviation of 5 years. (Round your answers to three decimal places.) esc (a) Construct a 95% confidence interval for the true average age (in years) of the consumers. years to years (b) Construct an 80% confidence interval for the true average age (in years) of the consumers. years to years (c) Discuss why the 95% and 80% confidence intervals are different. O Changing the confidence level or sample size while all else stays the same shifts the confidence interval left or right. 82°F Sunny Need Help? Read It Lo A O As the sample size decreases and all else stays the same, the confidence interval becomes narrower. As the confidence level decreases and all else stays the same, the confidence interval becomes narrower. O As…
You are given the sample mean and the population standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals. From a random sample of 70 dates, the mean record high daily temperature in a certain city has a mean of 86.37°F Assume the population standard deviation is 14.38 F The 90% confidence interval is ( I) (Round to two decimal places as needed.) The 95% confidence interval is ( D (Round to two decimal places as needed.) Which interval is wider? Choose the correct answer below. The 90% confidence interval The 95% confidence interval Interpret the results. O A. You can be 90% confident that the population mean record high temperature is between the bounds of the 90% confidence interval, and 95% confident for the G50% intonial Click to select your answer(S). 180min ZoT oo
upper and lower limit
(#20) please help
The confidence interval for population mean: ? is known (10 points) Administrators at a diamond drilling company want to know how much money they spent on equipment for the holes that were drilled in the past year. Of the holes drilled in the past year, a random sample of 200 holes was selected. The sample mean for money spent per hole drilled was $5,230. The administrators want to develop a 90% confidence interval estimate. Past studies have shown that the population standard deviation is σ = $500. (The sampling distribution is normally distributed and the critical value will be a z-value from the standard normal distribution)(a) Determine the standard error of the sampling distribution. (b) Determine the critical value, z, from the standard normal table. (c) Compute the confidence interval estimate for 90% confidence interval. (d) Compute the confidence interval estimate for 95% confidence interval.
Interpretation of the data. t = -3.4554, df = 6991, p-value = 0.0002763 alternative hypothesis: true mean is less than 50 95 percent confidence interval: -Inf 49.25556 sample estimates: mean of x 48.57909
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nework: Chap A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x = 850 and the sample standard deviation is s= 15. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of u with 95% confidence. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (b) Construct an interval estimate of u with 95% confidence, assuming that s 30. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (c) Construct an interval estimate of u with 95% confidence, assuming that s = 60. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (d) Describe how the confidence interval changes as s increases. The interval stays the same as s increases. The interval gets wider as s increases. O The interval gets narrower as s increases.
A service data on the body mass index of 654 young women the mean body mass index in the sample was X bar equals 26.8 service data on the body mass index of 654 young women the mean body mass index. We treated these data as an SRS from a normal distribution population with a standard deviation of 7.5 A. given 3 confidence intervals for the mean BMI in the population using 90 95 and 99% confidence. B. What are the margins of air for 90, 95 and 99% confidence? how does increasing the confidence level change the margin of error of a confidence interval when the sample size and population standard deviation remain the same

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