RESEARCH METHODS EXAM #21 FULLY ANSWERED QUESTIONS
Nominal - correct answer Researchers studying the effectiveness of a diet on heart
disease divided the study's participants into two groups—those with Type A
personalities and those with Type B personalities. Which scale of measurement
characterizes these personality
Ordinal - correct answer A professor at a university ranks subjects based on students'
preferences identified through a survey. He ranks science first, mathematics second,
and management third. What type of measurement scale has the professor employed?
They have an absolute zero point - correct answer which of the following statements is
true about ratio scales
Assessing students' ratings of their professors' performance on a five-point scale
ranging from poor to excellent - correct answer Which of the following examples best
represents the use of an interval scale?
Group percentages - correct answer The principal of a school conducts a survey to
compare the number of third grade and sixth grade students who buy their lunch at
school. The most appropriate way to describe the results of this survey would be to
compare:
They use a separate and distinct bar for each piece of information. - correct answer
Which of the following statements is true about bar graphs?
Median - correct answer A teacher displays the results of a test on a notice board. As
per the results, half the students scored more than 70 percent in the test, while the
remaining scored less than 70 percent. Which measure of central tendency does this
scenario
Range - correct answer which of the following is a measure of variablilty
To describe the strength of the relationship between two variables - correct answer A
correlation coefficient is always used _____.
Strength of the relationship between two variables - correct answer With respect to
Pearson r, the absolute size of r is the coefficient that indicates the:
The range of the variables has been restricted. - correct answer Dana measures the
height of four- and five-year-olds. To her surprise, she finds no correlation between
height and age. What is most likely responsible for this result?
Predict a score for Y from a known score of X. - correct answer A regression equation is
used to:
, Score on the aptitude test - correct answer Sumaira took an aptitude test for a position
with Accountants Unlimited. She was hired the following week. In this scenario, the
predictor variable is Sumaira's _____.
Are used to make conclusions about the data - correct answer Inferential statistics
_____
Inferential - correct answer Aden finds that, on an average, men have higher starting
salaries than women. In order to conclude that the differences in starting salaries are
true differences and not a result of random error, Aden would employ the use of _____
statistics.
Random error - correct answer When testing the differences between means, the null
hypothesis suggests that any observed difference is due to _____.
There is no difference in the ratings of responsibility between male and female drivers. -
correct answer When comparing the differences in the ratings of responsibility for an
automobile accident between male and female drivers, the null hypothesis would
suggest that:
Reject the null hypotheses - correct answer Adrian found no significant difference in the
amount of money spent on entertainment on those students who live on campus versus
those who live off campus. Based on this finding, Adrian would:
There is a low probability that the obtained results could be due to random error. -
correct answer The null hypothesis is rejected whenever:
Likely to be due to true differences between the groups. - correct answer Statistically,
significant results mean that the results are
There is a difference between Prime and Zenith in terms of quality. - correct answer A
researcher asked participants to rate the quality of two well-known brands of paper bags
—Prime and Zenith. Prime was rated higher than Zenith with mean ratings of 5.50 and
3.25 respectively. This difference was statistically significant at the .05 probability level.
The research hypothesis for this study suggests that:
Equals 0 - correct answer The expected value of t under the null hypothesis _____.
One-tailed t-test - correct answer A researcher wants to test a hypothesis according to
which the mean rating of guilt will be higher for unattractive defendants than for
attractive defendants. The appropriate statistical test would be the _____.
F-test - correct answer A student is interested in the effect of environmental conditions
on task performance. She makes participants complete a series of math problems
under different conditions of temperature—cold, warm, and hot, and different noise
Nominal - correct answer Researchers studying the effectiveness of a diet on heart
disease divided the study's participants into two groups—those with Type A
personalities and those with Type B personalities. Which scale of measurement
characterizes these personality
Ordinal - correct answer A professor at a university ranks subjects based on students'
preferences identified through a survey. He ranks science first, mathematics second,
and management third. What type of measurement scale has the professor employed?
They have an absolute zero point - correct answer which of the following statements is
true about ratio scales
Assessing students' ratings of their professors' performance on a five-point scale
ranging from poor to excellent - correct answer Which of the following examples best
represents the use of an interval scale?
Group percentages - correct answer The principal of a school conducts a survey to
compare the number of third grade and sixth grade students who buy their lunch at
school. The most appropriate way to describe the results of this survey would be to
compare:
They use a separate and distinct bar for each piece of information. - correct answer
Which of the following statements is true about bar graphs?
Median - correct answer A teacher displays the results of a test on a notice board. As
per the results, half the students scored more than 70 percent in the test, while the
remaining scored less than 70 percent. Which measure of central tendency does this
scenario
Range - correct answer which of the following is a measure of variablilty
To describe the strength of the relationship between two variables - correct answer A
correlation coefficient is always used _____.
Strength of the relationship between two variables - correct answer With respect to
Pearson r, the absolute size of r is the coefficient that indicates the:
The range of the variables has been restricted. - correct answer Dana measures the
height of four- and five-year-olds. To her surprise, she finds no correlation between
height and age. What is most likely responsible for this result?
Predict a score for Y from a known score of X. - correct answer A regression equation is
used to:
, Score on the aptitude test - correct answer Sumaira took an aptitude test for a position
with Accountants Unlimited. She was hired the following week. In this scenario, the
predictor variable is Sumaira's _____.
Are used to make conclusions about the data - correct answer Inferential statistics
_____
Inferential - correct answer Aden finds that, on an average, men have higher starting
salaries than women. In order to conclude that the differences in starting salaries are
true differences and not a result of random error, Aden would employ the use of _____
statistics.
Random error - correct answer When testing the differences between means, the null
hypothesis suggests that any observed difference is due to _____.
There is no difference in the ratings of responsibility between male and female drivers. -
correct answer When comparing the differences in the ratings of responsibility for an
automobile accident between male and female drivers, the null hypothesis would
suggest that:
Reject the null hypotheses - correct answer Adrian found no significant difference in the
amount of money spent on entertainment on those students who live on campus versus
those who live off campus. Based on this finding, Adrian would:
There is a low probability that the obtained results could be due to random error. -
correct answer The null hypothesis is rejected whenever:
Likely to be due to true differences between the groups. - correct answer Statistically,
significant results mean that the results are
There is a difference between Prime and Zenith in terms of quality. - correct answer A
researcher asked participants to rate the quality of two well-known brands of paper bags
—Prime and Zenith. Prime was rated higher than Zenith with mean ratings of 5.50 and
3.25 respectively. This difference was statistically significant at the .05 probability level.
The research hypothesis for this study suggests that:
Equals 0 - correct answer The expected value of t under the null hypothesis _____.
One-tailed t-test - correct answer A researcher wants to test a hypothesis according to
which the mean rating of guilt will be higher for unattractive defendants than for
attractive defendants. The appropriate statistical test would be the _____.
F-test - correct answer A student is interested in the effect of environmental conditions
on task performance. She makes participants complete a series of math problems
under different conditions of temperature—cold, warm, and hot, and different noise
