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A sample of 87 wealth-market mutual funds was chosen on February 1, 2016, and the average annual rate of return over the past 30 days was found to be 3.78 percent, and the sample standard deviation was 0.565 percent. A year earlier, a sample of 93 wealth-market funds showed an average rate of return of 4.91 percent, and the sample standard deviation was 1.39 percent. Is it reasonable to conclude (at a=0.01) that wealth-market interest rates declined during 2015?

A sample of 87 wealth-market mutual funds was chosen on February 1, 2016, and the average annual rate of return over the past 30 days was found to be 3.78 percent, and the sample standard deviation was 0.565 percent. A year earlier, a sample of 93 wealth-market funds showed an average rate of return of 4.91 percent, and the sample standard deviation was 1.39 percent. Is it reasonable to conclude (at a=0.01) that wealth-market interest rates declined during 2015?

MATLAB: An Introduction with Applications
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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Alignment Number Styles ther silicon chip sales are independent of where the XYZ country's economy is in the business cycle, data have been collecte K L. M 153 92 178 95 Q4 A sample of 87 wealth-market mutual funds was chosen on February 1, 2016, and the average annual rate of return over the past 30 days was found to be 3.78 percent, and the sample standard deviation was 0.565 percent. A year earlier, a sample of 93 wealth-market funds showed an average rate of return of 4.91 percent, and the sample standard deviation was 1.39 percent. Is it reasonable to conclude (at a=0.01) that wealth-market interest rates declined during 2015? A tire manufacturer warranties its tires to last at least Q5 20275 miles or "you get a new set of tires In its experience, a set of these tires lasts on average 26275 miles with standard deviation Assume that the wear is normally distributed. The manufacturer profits Rs. 20 on each set sold, and
Transcribed Image Text:Alignment Number Styles ther silicon chip sales are independent of where the XYZ country's economy is in the business cycle, data have been collecte K L. M 153 92 178 95 Q4 A sample of 87 wealth-market mutual funds was chosen on February 1, 2016, and the average annual rate of return over the past 30 days was found to be 3.78 percent, and the sample standard deviation was 0.565 percent. A year earlier, a sample of 93 wealth-market funds showed an average rate of return of 4.91 percent, and the sample standard deviation was 1.39 percent. Is it reasonable to conclude (at a=0.01) that wealth-market interest rates declined during 2015? A tire manufacturer warranties its tires to last at least Q5 20275 miles or "you get a new set of tires In its experience, a set of these tires lasts on average 26275 miles with standard deviation Assume that the wear is normally distributed. The manufacturer profits Rs. 20 on each set sold, and
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