Quize
3. Which of the situations below expresses a positive correlation?
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The fewer the parasites, the fewer the offspring. |
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Neither choice is correct. |
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The larger the building, the more the cost of upkeep. |
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Both choices are correct. |
4. When the correlation coefficient is zero, the points on the scatter plot
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appear to fall closely to the regression line |
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appear directly on the regression line |
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appear randomly scattered on the graph |
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cannot be plotted |
5 Given a correlation coefficient of zero, which conclusion is correct?
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A correlation coefficient is not proper for the data. |
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Cannot be interpreted. |
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There is no relationship between the variables. |
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All of the choices are correct. |
6.Whether a correlation coefficient is considered small, medium, or large is a question of
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effect size |
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reliability |
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cause and effect |
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truncation |
Your textbook recommends that the first step in working a problem should be to
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copy the data;
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re-read the problem;
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build a database; |
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estimate the answer. |
8. Which of the following words could legitimately fit into this sentence: “That simple frequency distribution has two _________, 13 and 18.”
10. What do you call measurements of a subset of a population?
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What is a graph with a great preponderance of low scores?
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negative skew |
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positive skew |
What is the Mean of the following data set?
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100 |
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79 |
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80 |
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59 |
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60 |
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72 |
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47 |
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30 |
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90 |
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95 |
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68 |
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78 |
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72 |
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73 |
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75 |
14.Which of the following is a paired samples design?
a. At a hunting club the squirrel hunters had a contest with the quail hunters to see who could hit the most moving targets.
b. A consumer-testing group compared Boraxo and Tide to determine which got stuff whiter. Sheets that had been placed for 12 hours in a bathtub of mud were washed and the amount of light reflected was measured with a photometer.
c. Fifth-grade American Indians were matched as a group to a group of New York Puerto Ricans on SES, IQ, and reading level. They were then given a questionnaire on attitudes toward school.
d. On the basis of a pretest on knowledge of foreign governments, each student in the 9:00 class was matched with a student in the 10:30 class. The 9:00 class used a "participant approach" to the study of politics and the 10:30 class used the "Heidleburg method." At the end of the term the same test was given to both classes.
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c |
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a |
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b |
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d |
15. With an acknowledgment to Sesame Street, "Which of these things is not like the others, which of these things doesn't belong?"
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independent samples |
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repeated measures |
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natural pairs |
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matched pairs |
16 . Identify the following as paired samples or independent samples. Also give the appropriate df.
Thirteen volunteers weighed themselves before and after a two-day fast.
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Paired, df=10 |
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Paired, df=12 |
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Paired, df=8 |
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Independent, df=12 |
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18. Tukey Honestly Significant Difference test is a(n) test.
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Question 17
A department chair in an academic department wanted to know if there was a difference between spring and fall enrollment in his department. The department offered the same six courses both semesters. What test should he conduct to determine if there is a significant difference in the enrollment between the semesters? Write up the results and determine what do the results mean?
Here is the data set:
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Spring |
Fall |
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30 |
50 |
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35 |
28 |
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40 |
30 |
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45 |
39 |
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50 |
40 |
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55 |
25 |
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