Answered: QUESTION 6 Test the claim that the…

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 well-known brokerage firm executive claimed that at least 90% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 800 people, 88% of them said they are confident of meeting their goals.

What practical conclusion can we make about the claim?

What would be our formal conclusion if we used a 0.01 significance level?

QUESTION 6
Test the claim that the proportion of people who are confident is smaller than 90% at the 0.05 significance level. Determine the test statistic to three decimal places.
029
QUESTION 7
Test the claim that the proportion of people who are confident is smaller than 90% at the 0.05 significance level. Determine the p-value to the fourth decimal place.
.0294

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