Answered: Determine whether the study is an…

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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41,42,43,44,45,46

Transcribed Image Text:Determine whether the study is an observational study or an experimental study. 41. A study follows two groups of students, who are randomly selected from a school, for one year. Students decide which group to join depending on which category they feel they belong to: I watch more than 10 hours of TV per week OR I watch fewer than 5 hours of TV per week. The study records the average grades and the percent of students who participate in team sports. 42. A teacher performs a study by comparing the grades on a final math exam of her students. She studied the grades of 25 students who used calculators on the exam and 25 students who did not use a calculator. The students chose whether or not to use a calculator. 43. A teacher performs a study by comparing the grades on a final math exam of her students by which brand of calculator they used during the test. She assigns one brand of calculator to half of her students and another brand of calculator to the other half. 44. A researcher wants to compare voter satisfaction levels between people who voted using a paper ballot versus those who used touch screen machines to vote. After an election, the researcher uses a random sample and surveys what type of voting method was used and the level of satisfaction. 45. Forty volunteers suffering from insomnia were divided into two groups. The first group was assigned to a special low carbohydrate diet while the other group continued their normal diet. 46. A group of women aged 65 and older were tracked for several years. Researchers found that those who had a vitamin B12 deficiency were twice as likely to suffer severe depression as those who did not have the vitamin deficiency. Choices for 41-46: A) Observational study B) Experimental study

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