A random sample of 11 Items Is drawn from a populatlon whose standard devlation Is unknown. The sample mean Is = 810 and thesample standard devlation Is s= 20. Use Appendix D to find the values of Student's t(a) Construct an Interval estimate of u with 98% confidence. (Round your answers to 3 decimal places.)The 98% confidence interval is fromto(b) Construct an Interval estimate of u with 98% confidence, assuming that s= 40. (Round your answers to 3 decimal places.)The 98% confidence interval is fromto(c) Construct an Interval estimate of u with 98% confidence, assuming that s= 80. (Round your answers to 3 decimal places.)The 98% confidence interval is fromto< Prev6 of 10Next >

Answered: Image /qna-images/answer/0831af5b-1a39-4577-9c70-e4c6530db7a8.jpg

Answered: A random sample of 11 Items Is drawn…

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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Suppose a certain species bird has an average weight of x = 3.2 grams. Based on previous studies we can assume that the weights of these birds have a normal distribution with sigma = 0.34 grams. For a small group of 18 birds , find a 98% confidence interval for the average weights of these birds. Write answer in interval notation with two decimal places.
A simple random sample of 60 items resulted in a sample mean of 71. The population standard deviation is 13. a. Compute the 95% confidence interval for the population mean (to 1 decimal). Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
Suppose we are able to use a normal model. In order to construct a 99% Confidence Interval, we have to find the margin of error (ME), and we can use the following formula: 2.579*SE, where SE is computed with the image that's attached to this problem. Using SE = 0.049, find ME for the 99% Confidence Interval. Round your answer to 3 decimal places.
If X = 143, o = 29, and n= 35, construct a 95% confidence interval estimate of the population mean, µu. (Round to two decimal places as needed.)
A simple random sample of size n = 15 is drawn from a population that is normally distributed. The sample mean is found to be x= 68 and the sample standard deviation is found to be s = 11. Construct a 95% confidence interval about the population mean. The lower bound is The upper bound is (Round to two decimal places as needed.)
A researcher is interested in studying the use of hypnosis to relieve pain. She took a random sample of 16 subjects and measured their sensory ratings. The mean of the sensory ratings was found to be 7.5 and standard deviation to be 2.3. It is known that the sensory ratings are normally distributed. Construct a 99% confidence interval for the mean sensory ratings of the population. a) (5.81, 9.19) b) (6.27, 8.73) c) (6.36, 8.64) d) (6.02, 8.98)
A simple random sample of size n= 12 is drawn from a population that is normally distributed. The sample mean is found to be x= 63 and the sample standard deviation is found to be s = 13. Construct a 95% confidence interval about the population mean. The lower bound is The upper bound is (Round to two decimal places as needed.)
A random sample of 17 values was selected from a population, and the sample standard deviation was computed to be 150. Based on this sample result, compute a 90% confidence interval estimate for the true population standard deviation. State the UPPER bound of this confidence interval. (Hint: Use the formula for calculating a confidence interval estimate for a population variance. For this problem, the chi-squared critical value you should use is 5.8919. Also, don't forget, it is asking you for the confidence interval for the standard deviation. Chapter 11.1) (Round to two decimal places as needed.)
The manager at a large fitness center keeps track of the amount of time it takes a sample of 65 clients to run a mile. She finds that the mean time to run a mile in this sample is x = 10.4 minutes and the standard deviation is s = 2.1 minutes. Assuming the sample is a simple random sample of all clients at this particular fitness center, find a 95% confidence interval H, the unknown mean running time of all clients from the fitness center. for (Give your answer as an interval in the form (lower limit, upper limit). Use decimal notation. Give the limits to two decimal places.) 95% confidence interval:
A researcher constructs a confidence interval using the value z*=1.44. What confidence level does their interval have
If X=115, 25, and n = 31, construct a 99% confidence interval estimate of the population mean, μ. ☐ sμs ☐ (Round to two decimal places as needed.)
A simple random sample of size n=17 is drawn from a population that is normally distributed. The sample mean is found to be x= 69 and the sample standard deviation is found to be s= 20. Construct a 95% confidence interval about the population mean. ..... The lower bound is The upper bound is

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