Answered: A researcher is interested in 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 researcher is interested in the relationship between levels of stress at work and self-reports of overall health. Stress at work is measured on a scale from 0 (no stress at work) to 100 (extreme levels of stress at work). The researcher conducts a study with 11 subjects and determines that the relationship between self-reports of stress and self-reports of overall heath is r = -.41. The results from this study resulted in p > .05, therefore the investigator should:

a. fail to reject the null, there was a significant linear relationship between stress and health

b. fail to reject the null, there was not a significant linear relationship between stress and health

c. reject the null, there was a significant linear relationship between stress and health

d. reject the null, there was not a significant linear relationship between stress and health

NEW STUDY:

Dr. Apnea conducted a study investigating the effects of sleep deprivation on complex problem solving. He gave 25 college students a problem-solving test at noon on one day and a second problem-solving test at noon the following day. He found that there was a statistically significant mean decrease of 4.7 between the two tests from the first day to the second day. The test yielded a Cohen’s d = .82.

Which of the following statements is an accurate interpretation of Dr. Apnea’s research?

a. It doesn’t matter how much sleep you get, some people just aren’t good at problem solving.

b. If you don’t get enough sleep your problem solving abilities suffer, but only with a small absolute magnitude.

c. If you don’t get enough sleep your problem solving abilities suffer with a medium absolute magnitude.

d. If you don’t get enough sleep your problem solving abilities suffer with a large absolute magnitude.

A researcher is interested in the relationship between socioeconomic status (SES) and rates of preventable disease. The researcher uses ANOVA and breaks apart SES into three samples, which are Low SES, Middle SES, and High SES. In this study, SES is treated as a(n) ______ variable.

a. nominal

b. ordinal

c. interval

d. ratio

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