computed f-value, critical values to be used at 98% confidence level, are the variances equal? aabbsample mean22.4518.50sample variance16.418.2sample size1515

Given that data table aa bb sample mean 22.45 18.50 sample variance 16.4 = (S12) 18.2 =…

Answered: omputed f-value, critical values to be…

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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na test of the effectiveness of garlic for lowering cholesterol, 47 subjects were treated with garlic in a processed tablet form. Cholesterol levels were measured before and after the treatment. The changes (before - after) in their levels of LDL cholesterol (in mg/dL) have a mean of 3.4 and a standard deviation of 19.8. Construct a 95% confidence interval estimate of the mean net change in LDL cholesterol after the garlic treatment. What does the confidence interval suggest about the effectiveness of garlic in reducing LDL cholesterol? Click here to view a t distribution table. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. What is the confidence interval estimate of the population mean µ? Omg/dL
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Sales personnel for Skilling Distributors submit weekly reports listing the customer contacts made during the week. A sample of 15 weekly reports showed a sample mean of 19.5 customer contacts per week. The sample standard deviation was 5.2. Provide a 90% confidence interval for the population mean number of weekly customer contacts for the sales personnel.
Variability in Daily Change in Stock Price. Consider a day when the Dow Jones Industrial Average went up 149.82 points. The following table shows the stock price changes for a sample of 12 companies on that day. Compute the sample variance for the daily price change. Compute the sample standard deviation for the price change Provide 95% confidence interval estimates of the population variance and the population standard deviation. Price Change Price Change Company ($) Company ($) Aflac 0.81 Johnson & Johnson 1.46 Altice USA 0.41 Loews Corporation 0.92 Bank of America -0.05 Nokia Corporation 0.21 Diageo plc 1.32 Sempra Energy 0.97 Fluor Corporation 2.37…
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A market research group would like to know the satisfaction of subscribers in terms of the quality of service provided by Smart Communications and Globe Telecom. Using a survey, they gathered data from two independent samples. The data below summarizes the average customer satisfaction score (out of 10) towards the quality of services of their mobile providers. The satisfaction score is assumed to be normally distributed with unknown and UNEQUAL population variances. Statistics Smart Communications Globe Telecom Mean 4.20 3.15 Standard Deviation 1.25 2.25 Sample Size 25 20 a) Is there a difference in the average satisfaction scores of subscribers from Smart Communications and Globe Telecom? Make the comparisons at the 10% and 5% levels of significance. b) On average, are subscribers from Smart Communications more satisfied with their service provider than from the subscribers from Globe Telecom? Use the 5% and 1% levels of significance.
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	aa	bb
sample mean	22.45	18.50
sample variance	16.4	18.2
sample size	15	15

omputed f-value, critical values to be used at 98% confidence level, are the variances equal? aa bb