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Quizzes-1-3-MC.pdf - QUIZ 1 Using the average score to...

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QUIZ 1 Using the average score to describe a sample is an example of inferential statistics. FALSE A researcher is interested in the average income for registered voters in the United States. The entire group of registered voters is an example of a population. TRUE A researcher interested in vocabulary development obtains a sample of 3-year-old children to participate in a research study. The average score for the group of children is an example of a parameter. FALSE The goal for an experiment is to demonstrate that changes in one variable are responsible for causing changes in a second variable. TRUE A correlational study typically uses only one group of participants but measures two different variables (two scores) for each individual. TRUE A correlational study is used to examine the relationship between two variables but cannot determine whether it is a cause-and-effect relationship. TRUE A recent report concluded that college graduates have higher life-satisfaction scores than individuals who do not receive college degrees. For this study, graduating versus not graduating is an example of a quasi-independent variable. TRUE A discrete variable must be measured on a nominal or an ordinal scale. FALSE Classifying people into two groups on the basis of gender is an example of measurement on an ordinal scale. FALSE To compute SX 2 , you first add the scores, then square the total. FALSE The final step in computing S(X + 1) 2 is to square the sum of the (X + 1) values. FALSE For the following scores, S(X + 1) 2 = 81. Scores: 1, 3, 0, 1 FALSE For the following scores, SX 2 = 35. Scores: 1, 3,5 TRUE For the following distribution of scores, 20% of the individuals have scores of X = 1. X f 5 2 4 8 3 5 2 3 1 2 FALSE https://www.coursehero.com/file/19674262/Stats-quizpdf/ This study resource was shared via CourseHero.com
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A grouped frequency distribution table lists one interval as 20-29. The width of this interval is 9 points. FALSE A grouped frequency distribution table does not provide enough information to obtain a complete listing of the original set of scores. TRUE A professor records the number of students who are absent each day for the semester. Because this is a discrete variable, a bar graph should be used to show the frequency distribution. FALSE A sports historian recorded the number of times that the New York Yankees finished 1 st , 2 nd , 3 rd , and so on, in their division for the past 20 years. If the results are presented in a frequency distribution graph, then a histogram should be used. FALSE The classrooms in the Psychology department are numbered from 100 to 108. A professor records the number of classes held in each room during the fall semester. If the results were presented in a frequency distribution graph, the professor should use a bar graph. TRUE The normal distribution is an example of a symmetrical distribution. TRUE
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