A random sample of size 49 from normal population yields,mean = 7.4 and standard deviation = 5.4. The lower boundof a 99 percent confidence interval for population mean isO a. 6.11O b. 5.33O c. 5.85O d. 6.40For the following hypothesis test:HO: ma 26HA: m < 26a: 0.025with n = 50, a 16, and 43, which of the following isTRUE?Select one:O a. reject null hypothesis and conclude that the meanis less than 26O b. fail to reject null hypothesis and conclude that themean is equal to or greater than 26O c. reject null hypothesis and conclude that the meanis equal to or greater than 26O d. fail to reject null hypothesis and conclude that the isless than 26

Given Sample size n =49 Degrees of freedom=df=49-1=48 Sample mean=Xbar =7.4 Sample standard…

Answered: A random sample of size 49 from normal…

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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The average life of light bulbs produced by SABA Electric Co. is expected to be normally distributed with the mean service life of 950 hours and standard deviation of 100 hours. A consumer agency tests a random sample of 100 bulbs and finds mean service life of 910 hours. If the agency conducts hypothesis testing, what would be the computed p-value for the test? 4 10 0% 3.49 none of the above.
If a sample of size n = 25 is chosen from a normal population, which one of the following is a 95% confidence interval for the population mean when the sample mean is 50 and the sample standard deviation is 6.5? 50 2.064(6.5) O 50 ± 2.06(1.3) 50 ± 2.06(6.5) O 50± 2,064(1.3)
A random sample of size 49 from normal population yields, mean = 7.2 and standard deviation = 2.8. The lower bound of a 99 percent confidence interval for population mean is O a. 6.40 O b. 6.53 O c. 6.13 O d. 6.68
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53.305) B. (24.591, 35.563) C. (26.591, 37.563) D. (28.591, 39.563) 34. A simple random sample of size n = 36 is taken from a normally distributed original population. The sample standard deviation iss = 7. Find the 99% confidence interval for the population variance o2. A. (27.453, 98.756) B. (28.453, 99.756) C. (29.453, 100.756) D. (30.453, 101.756)
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The manager at a large fitness centre keeps track of amount of time it takes a sample of 65 clients to run a mile she finds the mean time to run a mile in this sample is 10.4 minutes with standard deviation of 2.1 minutes. Assume that the sample is random sample that is normally distributed. a. Construct a 68, 95, 99 confidence interval for the parameter of interest in this problem.
Q-3) Show all the steps for the problem.
b )part?
The composite ACT scores for Idaho students who took the test in 2019 have average 22.3 with the standard deviation 2.25 and approximately normal distributed. In a random sample of 49 students who took the exam in 2019, the average composite ACT score is 23.5 with standard deviation 1.06. (show your work) Which one is true? 3 and 2.25 are statistics, and 1.06 are parameters. 3 and 2.25 are parameters, and 1.06 are statistics. All numbers 22.3, 2.25 and 23.5, 1.06 are parameters. All numbers 22.3, 2.25 and 23.5, 1.06 are statistics. What is the probability that the score is 23 or more if we random select one student? Find the 85th percentile the composite ACT scores for Idaho students
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