ResearchMethodsExam3 Chp.......
Notes
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Which of the following is one of the three basic ways of describing the results of research investigations?
comparing group percentages
Unlike nominal scale variables, interval scale variables have
detailed quantitative properties.
When studying the effect of temperature on the sales of ice creams, a researcher records the number of ice creams sold on cold days and the number sold on hot days. In this scenario, the researcher will most likely compare _____ to describe the results.
group means
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
group percentages.
A _____ uses bars to display a frequency distribution for a quantitative variable.
histogram
The standard deviation is appropriate only for
interval and ratio scale variables.
An interval scale is preferable to an ordinal scale because
it allows for more sophisticated statistical treatments.
The _____ is an appropriate indicator of central tendency only when scores are measured on an interval or ratio scale.
mean
The _____ of a set of scores is obtained by adding all the scores and dividing by the number of scores.
mean
The _____ is an appropriate measure of central tendency if a nominal scale is used.
mode
A professor at a university ranks subjects based on students' preferences identified through a survey. Science is ranked first, mathematics second, and management third. In this scenario, which of the following types of measurement scale has the professor employed?
ordinal scale
The _____ indicates the average deviation of scores from the mean.
standard deviation
A teacher displays the results of a test on a notice board. According to the results, half of the students had scored more than 70 percent in the test. Which measure of central tendency does this scenario exemplify?
the median
Which of the following is a measure of central tendency?
the median
A measure of _____ is a number that characterizes the amount of spread in a distribution of scores.
variability
Which of the following statements is true about ratio scales?
They are best exemplified by time, weight, length, and other physical measures.
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 best characterizes these personality variables?
a nominal scale
Which of the following scales of measurement lacks numerical properties?
a nominal scale
Three celebrity judges rank the finalists of a reality show on the basis of their musical talents. The judges rank the contestants in the order of the most talented to the least talented. Which type of measurement scale does this scenario exemplify?
an ordinal scale
Which of the following examples best represents the use of an interval scale?
assessing students' ratings of their professors' performance on a five-point scale ranging from poor to excellent
