QUESTION 1

1. What do we call a number that is generated by dividing ∑ by the N in a distribution?

Mode

Mean

Median

Range

3 points

QUESTION 2

1. If p < .05, then you can assume:
The results are significant.
You can reject the null hypothesis.
Results more extreme occur fewer than 5 times in 100.
All of the above.
3 points
QUESTION 3
1. A distribution with two separated peaks is a _____distribution; one that is normal is a ______ distribution.
Bimodal; Rectangular
Rectangular; Bimodal
Bimodal; Bell-Shaped
Rectangular; Bell-shaped
3 points
QUESTION 4
1. Taking chance factors into account when you sample to reach conclusions about a population is a definition of ______________________________.
scales of measurement
rationalism
descriptive statistics
inferential statistics
3 points
QUESTION 5
1. A Spearman’s rs examines correlations between ranked data.
True
False
3 points
QUESTION 6
1. In terms of regression, a correlation coefficient of 1.00 allows that there may be a cause and effect relationship; a correlation coefficient of .00 indicates that there is no cause and effect relationship.
True
False
3 points
QUESTION 7
1. As a general rule, quantitative research articles are shorter in length because of their deductive approach and use of numbers to express relationships.
True
False
3 points
QUESTION 8
1. A researcher conducted an ANOVA, and the data indicated that there were significant differences between the groups (p < .01). The researcher should conduct a series of independent sample t-tests to determine where the differences in the groups occur.
True
False
3 points
QUESTION 9
1. In general, it is always important to remember the questions that are asked in any study you perform. Virtually everything you do from writing the research design to writing the study’s implications is dictated by the research questions.
True
False
3 points
QUESTION 10
1. An independent samples t-test is a nonparametric test because it features means and standard deviations.
True
False
3 points
QUESTION 11
1. This distribution occurs when the mean, median, and mode are the same.4 points
QUESTION 12
1. For what purpose do scholars use a Pearson’s Product Moment r?4 points
QUESTION 13
1. A researcher computes an independent sample t-test and determines that p < .05. What does this mean?4 points
QUESTION 14
1. Describe parametric tests.4 points
QUESTION 15
1. Describe the ANOVA (One way)4 points
QUESTION 16
1. A professor is interested in knowing the correlation, if any, of students’ scores on the first and second exams given in his class.Test 1 Test 2
92 86
90 87
89 85
82 90
88 79
92 90
100 92
91 84Select the correct statistical test; perform the test; report the results according to the handbook guidelines; explain what the results mean to the professor. Be sure to include an appropriate narrative and report.10 points
QUESTION 17
1. With respect to the situation in question 16, what other test could the professor use that would yield valid results by looking for differences. What would be the statistical result of the test?10 points
QUESTION 18
1.Now, let’s look at a situation in which we compare three college math teachers to each other with respect to how interested they keep their students. The study was conducted among freshmen enrolled in an introductory course. The unit was quadratic equations. Students were asked to jot down an x on a piece of paper every time they found their attention drifting away from the lecture.Here are data from one fifty minute lecture:Teacher A Teacher B Teacher C
5 9 4
5 7 4
7 4 6
4 7 5
6 8 6
6 7 5
5 4 4
5 5 6What test or tests would you use to rule out chance from causing the apparent differences in these data?Select the correct statistical test; perform the test; report the results according to the handbook guidelines; explain what the results mean to the professor. Remember to include an appropriate narrative and report.10 points
QUESTION 19
1. In a study by Latane and Dabbs (1975), an experimenter entered hundreds of elevators and “accidently” dropped a bunch of pencils. Some bystanders helped pick them up and some did not. Of the 1303 females, 300 helped. Of the 1320 males, 370 helped. (Was gender related to helpfulness?). Select the correct statistical test; perform the test; report the results according to the handbook guidelines; explain what the results mean.10 points
QUESTION 20
1. A researcher examines factors that affect thinking. In one study, she had three groups of participants work on seven problems that required creative thinking. One group prepared for the task by exercising; a second group watched a comedy video; the third group was a control group that simply began work on the problems. The scores below show the number correct for each participant.
Exercise Comedy Control
5 4 4
4 7 2
1 6 1
2 5 1
3 3 3
0 4 2
2 7 0
2.
3. Select the correct statistical test; perform the test, and any subsequent post-hoc tests; report the results according to the handbook guidelines; explain what the results mean.