PS370 Research Methods in Psychology Online Exam 3 Answers (Ashworth College)

PS370 Research Methods in
Psychology Online Exam 3 Answers
(Ashworth College)
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PS370 Research Methods in Psychology Online Exam 3 Answers (Ashworth College)
Question 1 of 20
5.0/ 5.0 Points
Cross-tabulation can be used with __________ measures.
A. ordinal
B. ratio
C. nominal
D. All of the above
Question 2 of 20
5.0/ 5.0 Points
All of the following belong to the realm of descriptive statistics EXCEPT:
A. frequency counts and distributions.
B. the null hypothesis.
C. summary statistics.
D. graphical representations of data.
Question 3 of 20
0.0/ 5.0 Points
A researcher needs to pick six numbers so that the total adds up to 180. The number of degrees of freedom
would be:
A. 6. B. 7. C. 4. D. 5. (NOTE NOT A. EITHER)
Question 4 of 20
0.0/ 5.0 Points
What will happen if the researcher increases the level of Type I error without making any other changes?
A. The level of Type II error will increase.
B. The level of Type II error will decrease.
C. Alpha will decrease.
D. There will be no change in either alpha or the level of Type II error.

(NOTE) NOT A. EITHER)
Question 5 of 20
5.0/ 5.0 Points
When using SPSS for Windows to compute a regression line, you should also request a __________ to see
how well the data fits a straight line function.
A. product-moment correlation
B. scatter plot
C. MANOVA
D. median graph
Question 6 of 20
0.0/ 5.0 Points
Which correlation represents the strongest relationship?
A. +.37 B. +.68 C. -.02 D. -.73
Question 7 of 20
5.0/ 5.0 Points
As group size increases:
A. frequency polygons appear more jagged.
B. histograms will look like normal curves.
C. frequency polygons appear smoother.
D. frequency polygons will look like normal curves.
Question 8 of 20
5.0/ 5.0 Points
In a study on the effects of a new type of soft lighting on task efficiency using two groups of office workers as
the participants, what is the null hypothesis?
A. There will be no task efficiency difference between the groups in the two conditions.
B. The effects of the lights on one group will be nullified by the effects on the other group.
C. The new type of lighting will lead to greater task efficiency.
D. The new type of lighting will lead to lower task efficiency.
Question 9 of 20
5.0/ 5.0 Points
A researcher wants to study all 2000 college graduates from the University of Hawaii. She gathers data from all
the college graduates at the University of Hawaii in the year 2000. She has studied a:
A. reference group. B. sample. C. population. D. statistic.
Question 10 of 20
5.0/ 5.0 Points
The association between two variables is best indexed by the:
A. standard deviation.
B. variance.
C. sum of squares.
D. correlation coefficient.
Question 11 of 20
5.0/ 5.0 Points
The purpose of descriptive statistics is to:
A. determine if the sample data accurately describe the population.
B. simplify and organize large sets of data.

C. help us decide whether population means are equal.
D. All of the above
Question 12 of 20
5.0/ 5.0 Points
In a study on bruxism (grinding of the teeth), participants recorded for six months the number of times per day
they experienced facial pain. The data described above can be represented pictorially by a graph called a:
A. frequency parabola. B. biaxial distribution.
C. frequency tetrahedron. D. frequency polygon.
Question 13 of 20
5.0/ 5.0 Points
In a study on medication compliance in residents of a skilled nursing facility, the researcher wants to do a
"median split." Where would the researcher find the median of the distribution of compliance scores?
A. At the 30th percentile B. At the 50th percentile C. At the 100th percentile
D. At the same point as the mode of the distribution
Question 14 of 20
5.0/ 5.0 Points
An advantage of a frequency polygon is that:
A. two frequency distributions can be compared on the same graph.
B. only one frequency distribution can be plotted on one graph.
C. no further statistical analysis is necessary.
D. the data need no explanation or interpretation.
Question 15 of 20
5.0/ 5.0 Points
The goal in psychological experimentation is to show that differences on dependent measures are due to:
A. preexisting individual differences.
B. research manipulations. C. research manipulations and measurement error.
D. individual differences that were manipulated by the researcher.
Question 16 of 20
5.0/ 5.0 Points
In a classroom for gifted students, we would expect the distribution of IQ scores to be:
A. rectilinear. B. identical. C. skewed. D. symmetric.
Question 17 of 20
5.0/ 5.0 Points
Statistical simplification for nominal or ordinal data is often done by using:
A. a t-test. B. frequency distributions.
C. means. D. standard deviations.
Question 18 of 20
5.0/ 5.0 Points
As effect size increases:
A. power will increase. B. power will decrease.
C. power is unchanged. D. the sample size increases.
Question 19 of 20
5.0/ 5.0 Points
What is the appropriate statistical procedure for evaluating the difference among two or more groups?

A. ANOVA B. t-test C. Standard deviation D. Either A or B
Question 20 of 20
5.0/ 5.0 Points
A researcher wants to measure the relationship between age and score on this test. The most appropriate
statistic would be the:
A. Spearman rank-order correlation.
B. sign test.
C. Pearson product-moment correlation.
D. repeated measures ANOVA.