Exam 3: Graphic Representation of Frequency Distributions

A histogram is constructed for the distribution of hourly wages for a group of students. The boundaries of the rectangle for the interval $2.50-2.74 will fall at

The midpoint of the interval 23-26 is

Which of the following graphs may be constructed to show relative frequency?

Construct a cumulative percentage frequency distribution of retention scores obtained in Problem 9 of Chapter 3 (Instructor's Manual). Make a large accurate graph: use graph paper.

The following is the distribution of complaints of students visiting the counseling center of a small college: academic problems (59), social relationships (28), romantic relationships (46), depression (39), anxiety (12), somatic complaints such as headaches or sleeplessness (28), all others (32). Construct a graph to exhibit these data. Include a title and appropriate labels.

The lowest interval in which any cases fall is 30-39. The frequency polygon will come down to the X axis at ____________ on the left.

A human factors psychologist is engaged in a program of research to improve the readability of cockpit instrument panels. The data give the results of one of her experiments using 200 Air Force pilot trainees as subjects. The reaction time (RT) to simple and complex stimuli is measured in milliseconds. Plot the percentage frequency polygons for the two sets of data. Put them both on the same graph. Compare the two distributions and record your conclusions.

An advantage of the histogram over the frequency polygon is that it better represents

The cumulative graph tends to form an S-shaped figure when the uncumulated distribution has

For a histogram, the area encompassed by each bar represents

Plotting the graph of a cumulative distribution differs from plotting the graph of an uncumulated distribution in that

Construct a histogram and frequency polygon for the distribution of achievement test scores by university freshmen obtained in Problem 5 of Chapter 2 (Instructor's Manual).

Which graph is best suited for a frequency distribution representing a continuous variable?

In a university, male psychology majors are distributed as follows: 24 freshmen, 61 sophomores, 109 juniors, 104 seniors, and 92 graduate students. Comparable figures for women (in the same order of classification) are: 74, 58, 99, 53, and 67. Construct a bar diagram suitable for displaying the comparative relation between the sexes; include a title and appropriate labels. What conclusions appear significant from inspection of these data?

In comparing two or more frequency distributions with different numbers of cases, the preferred graph is the

In constructing a frequency polygon, the frequency for the interval 40-49 would be plotted at

The Y-axis is also called the

Describe the similarities of and differences between a bar diagram and a histogram.

In general, a graph

Suppose the frequency curve below is based on 400 cases and is drawn to a much larger scale on a blackboard. Suppose the total area under the blackboard version is 200 square inches. (a) If the area between scores of 30 and 40 equals 50 square inches, how many cases fall between 30 and 40? (b) Suppose 160 cases fall above a score of 50. What is the area under the curve above a score of 50?