A well-known brokerage firm executive claimed that 40% of investors are currently confident of meeting theirinvestment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sampleof 800 people, 44% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is larger than 40% at the 0.10 significance level.The null and alternative hypothesis would be:=Hop≥ 0.4 Ho: μ 0.4 Ho: pH₁ p < 0.4 H₁ : μ‡0.4:The test is:The test statistic is:two-tailed left-tailed right-tailed oThe p-value is:Based on this we:0.4 H : < 0.4 H:p<0.4 Ho:p>0.4 ởH₁ μ> 0.4 H₁: p > 0.4 H₁: μ< 0.4:H₁: p0.4Reject the null hypothesisFail to reject the null hypothesis(to 3 decimals)(to 4 decimals)

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Answered: A well-known brokerage firm executive…

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 study of 420,048 cell phone users found that 137 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0256% for those not using cell phones. Complete parts (a) and (b). a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. enter your response here%<p<enter your response here% (Round to three decimal places as needed.) b. Do cell phone users appear to have a rate of cancer of the brain or nervous system that is different from the rate of such cancer among those not using cell phones? Why or why not? A. No, because 0.0256% is included in the confidence interval. B. Yes, because 0.0256% is included in the confidence interval. C. Yes, because 0.0256% is not included in the confidence interval. D. No, because 0.0256% is not…
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