Psych 280 Exam Questions and Answers Already Passed Latest Update 2025-2026
The ________ of a set of scores is obtained by adding all the scores and dividing by the number
of scores. - Answers mean
Which of the following statements is true about nominal scales? - Answers The levels of these
scale variables are simply different categories or groups.
When describing relationships between variables, a correlation of 0.00 indicates that - Answers
there is no relationship between the variables.
A ________ uses bars to display a frequency distribution for a quantitative variable. - Answers
histogram
The principal of a school conducts a survey to compare the number of third-grade and sixth-
grade students who buy lunch from school. The most appropriate way to describe the results of
this survey is to compare - Answers group percentages.
The ________ is an appropriate indicator of central tendency only when scores are measured on
an interval or ratio scale. - Answers mean
A researcher employs inferential statistics to examine the difference in mean scores obtained
by fourth grade boys and girls in a standardized math test. In this case, inferential statistics -
Answers indicate the probability that the difference between means reflects random error.
A one-tailed statistical test is used when - Answers there is a specific prediction regarding the
direction of difference between groups.
Inferential statistics - Answers are used to make conclusions about data.
If both the independent and dependent variables use nominal scale properties, the most
appropriate statistical test would be the - Answers ________ variance is the deviation of the
individual scores in each group from their respective group means.
Which statistical test would be most appropriate for examining the relationship between
temperature and the number of ice cream cones sold? - Answers Pearson correlation
Which of the following statements is true about systematic variance? - Answers It is small when
the difference between group means is small.
In studies that require human participants, the most available population consists of - Answers
college students.
Which of the following statements is true of conceptual replications? - Answers They are more
important than exact replications in furthering one's understanding of behavior.
A failure to replicate could mean that the - Answers original results are invalid.
The ________ of a set of scores is obtained by adding all the scores and dividing by the number
of scores. - Answers mean
Which of the following statements is true about nominal scales? - Answers The levels of these
scale variables are simply different categories or groups.
When describing relationships between variables, a correlation of 0.00 indicates that - Answers
there is no relationship between the variables.
A ________ uses bars to display a frequency distribution for a quantitative variable. - Answers
histogram
The principal of a school conducts a survey to compare the number of third-grade and sixth-
grade students who buy lunch from school. The most appropriate way to describe the results of
this survey is to compare - Answers group percentages.
The ________ is an appropriate indicator of central tendency only when scores are measured on
an interval or ratio scale. - Answers mean
A researcher employs inferential statistics to examine the difference in mean scores obtained
by fourth grade boys and girls in a standardized math test. In this case, inferential statistics -
Answers indicate the probability that the difference between means reflects random error.
A one-tailed statistical test is used when - Answers there is a specific prediction regarding the
direction of difference between groups.
Inferential statistics - Answers are used to make conclusions about data.
If both the independent and dependent variables use nominal scale properties, the most
appropriate statistical test would be the - Answers ________ variance is the deviation of the
individual scores in each group from their respective group means.
Which statistical test would be most appropriate for examining the relationship between
temperature and the number of ice cream cones sold? - Answers Pearson correlation
Which of the following statements is true about systematic variance? - Answers It is small when
the difference between group means is small.
In studies that require human participants, the most available population consists of - Answers
college students.
Which of the following statements is true of conceptual replications? - Answers They are more
important than exact replications in furthering one's understanding of behavior.
A failure to replicate could mean that the - Answers original results are invalid.
