A well-known brokerage firm executive claimed that 20% 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, 19% of them said they are confident of meeting their goals. Test the claim that the proportion of people who are confident is smaller than 20% at the 0.025 significance level. The null and alternative hypothesis would be: Ho :µ = 0.2 Ho:µ > 0.2 Ho:p > 0.2 H1: µ + 0.2 H1:µ < 0.2 H1:p < 0.2 Но р< 0.2 Но: и < 0.2 Но :р H1:p > 0.2 H1:µ > 0.2 H1:p + 0.2 0.2 The test statistic is: (to 3 decimals) The p-value is: (to 4 decimals)

A well-known brokerage firm executive claimed that 20% 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, 19% of them said they are confident of meeting their goals. Test the claim that the proportion of people who are confident is smaller than 20% at the 0.025 significance level. The null and alternative hypothesis would be: Ho :µ = 0.2 Ho:µ > 0.2 Ho:p > 0.2 H1: µ + 0.2 H1:µ < 0.2 H1:p < 0.2 Но р< 0.2 Но: и < 0.2 Но :р H1:p > 0.2 H1:µ > 0.2 H1:p + 0.2 0.2 The test statistic is: (to 3 decimals) The p-value is: (to 4 decimals)

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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 70% 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 100 people, 77% of them said they are confident of meeting their goals. Test the claim that the proportion of people who are confident is larger than 70% at the 0.025 significance level. The null and alternative hypothesis would be: Ho:µ = 0.7 Ho : µ = 0.7 Ho:p= 0.7 Họ:p = 0.7 Họ:µ = 0.7 Ho:p= 0.7 H1: µ 0.7 H1:p > 0.7 %3D %3D %3D %3D The test is: right-tailed two-tailed left-tailed The test statistic is: (to 3 decimals) The p-value is: (to 4 decimals) Based on this we: Fail to reject the null hypothesis O Reject the null hypothesis Question Help: D Post to forum Submit Question ☆吧( NOV 20 W 3D ロ

A physical therapist is interested in studying the proportion of adults that receive a physical therapy treatment plan due to sciatica. The physical therapist states the proportion of adults that receive a physical therapy treatment plan due to sciatica is less than 0.30. If we would like to test the physical therapist's claim with a hypothesis test using a significance level of α=0.10 , which of the following choices are true? Select the correct answer below: There is a 10% chance we will conclude p=0.30, but is in fact p<0.30. There is a 10% chance of rejecting the null hypothesis. There is a 10% chance we will conclude p<0.30, but is in fact p=0.30. There is a 10% chance that p<0.30
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A survey asked senior executives at large corporations their opinions about the economic outlook for the future. One question was, "Do you think that there will be an increase in the number of full-time employees at your company over the next 12 months?" In the current survey, 220 of 400 executives answered Yes, while in a previous year survey, 176 of 400 executives had answered Yes. Provide a 95% confidence interval estimate for the difference between the proportions at the two points in time. (Use current year − previous year. Round your answer to four decimal places.) to
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