Answered: Using the 1 percent significance level,…

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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From a research survey, it was found that a random sample of 18 elementary graduates of an exclusive private school has a mean NEAT score of 90 with a standard deviation of 16, while a random sample of 24 elementary graduates of a public school showed a mean NEAT score of 85 with a standard deviation of 12. Is there a significant difference in the NEAT performance of these two groups of elementary graduates? a. Use the traditional method, and b. The P-value method c. Construct a 95% confidence interval for the difference in mean.
The fire chief selects a sample of 49 local firefighters from a population with a mean physical fitness rating of 72 and a standard deviation of 7 on a 100 point scale. The mean of the sample equals 74. The chief is interested in whether the fitness of the officers is now different from the original population value. Construct the appropriate hypothesis and perform the appropriate test with α set to .05. Compute the effect size Construct and interpret the 95% confidence interval around the sample mean.
The sample mean and the sample standard deviation of annual returns on a stock over a 12-year period as computed by a stock analyst were 18% and 12%, respectively. The analyst wantsto know if the risk, as measured by the standard deviation, differs from 15%.a. Construct a 90% confidence interval of the population variance and the population standarddeviation.b. What assumption is required in constructing the confidence interval?c. Based on the above confidence interval, does the risk differ from 15%

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Using the 1 percent significance level, is the process on control or necessary adjustments are required? (Use the five steps of hypothesis testing to test this hypothesis) b) Hence, construct a 95 percent confidence interval for the mean. (Critical t, or t- table = 3.106)