5.A researcher constructed a 95% confidence interval for the true mean number of years students take to earn abachelor's degree. His results were (4.319, 4.841).a. What is the point estimate for the average number of years to complete a bachelor's degree?b. Does his interval support or contradict the widely held belief that it takes 4 years to complete a bachelor's degree?Why or why not?

a.) To find the point estimate for the average number of years to complete a bachelor's degree when…

Answered: 5. A researcher constructed a 95%…

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 Gallup poll of 1001 Americans age 18 and over conducted in May of 2013 found that 80% of the respondents "strongly agree" that K- 12 schools should teach critical thinking to children. Write a meaningful sentence interpreting your interval. We are 95% confident that the true percentage of all adult Americans who "strongly agree" that K-12 schools should teach children critical thinking is between 76.8% and 83.2%. We are 95% confident that the true percentage of the 1001 Americans who "strongly agree" that K-12 schools should teach children critical thinking is between 76.8% and 83.2%. We are 95% confident that the true percentage of all Americans who "strongly agree" that K-12 schools should teach children critical thinking is 80%. We are 95% confident that the true percentage of the 1001 Americans who "strongly agree" that K-12 schools should teach children critical thinking is 80%.
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2.2 According to Watch Corporation, its watches usually gain or lose time over the course of a week. The following weekly gains (+) or losses (-) in seconds were recorded by a sample of 18 watches. -0.38 -0.20 -0.38 -0.32 -0.37 -0.61 -0.48 -0.47 Your answer +0.32 -0.64 -0.23 +0.30 -0.04 -0.20 Your answer +0.25 -0.68 State the null and the alternate hypotheses whether the mean gain or loss in time for the watches is 0 or not? -0.10 +0.05 By from 2.2 Is it reasonable to conclude that the mean gain or loss in time for the watches is 0? Use the .05 significance level. How do you know that?
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The following equation was estimated by OLS: Unipa = 1.392 - 0.0135 psperc + 0..00148 sat n = 4,137, R2 = 0.273 Where unipa is measured on a four-point scale, psperc is the percentile in the post- sixteen class (defined so that, for example, psperc =5 means the top 5% of the class), and sat is the combined maths and verbal scores on the student achievement test.
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