1. In the experiment of A and B consumers, 20 sample points are set for A consumers, and t he average value of word-of-mouth is 10.1 with a variance of 2.2; 19 sample points are set for B consumers, and the average value of word-of-mouth is 10.9 with a variance of 2.7. Co mpare whether there is significant difference between the average word-of-mouth of A and B consumers. (a=0.05) (10')

1. In the experiment of A and B consumers, 20 sample points are set for A consumers, and t he average value of word-of-mouth is 10.1 with a variance of 2.2; 19 sample points are set for B consumers, and the average value of word-of-mouth is 10.9 with a variance of 2.7. Co mpare whether there is significant difference between the average word-of-mouth of A and B consumers. (a=0.05) (10')

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Description: 1. In the experiment of A and B consumers, 20 sample points are set for A consumers, and the average value of word-of-mouth is 10.1 with a variance of 2.2; 19 sample points are setfor B consumers, and the average value of word-of-mouth is 10.9 with

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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A factor in determining the usefulness of an examination as a measure of demonstrated ability is the amount of spread that occurs in the grades. If the spread or variation of examination scores is very small, it usually means that the examination was either too hard or too easy. However, if the variance of scores is moderately large, then there is a definite difference in scores between "better," "average," and "poorer" students. A group of attorneys in a Midwest state has been given the task of making up this year's bar examination for the state. The examination has 500 total possible points, and from the history of past examinations, it is known that a standard deviation of around 60 points is desirable. Of course, too large or too small a standard deviation is not good. The attorneys want to test their examination to see how good it is. A preliminary version of the examination (with slight modifications to protect the integrity of the real examination) is given to a random sample of…
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