Exam 3: Frequency Distributions

Consider the following score diagram. This score diagram is called a _________.

Define histogram.

If a curve is negatively skewed, most of the scores occur at the higher values and the curve tails off toward the lower end of the horizontal axis.

One reason for constructing frequency distributions is to be able to visualize the shape of the distribution.

A percentile point is defined as _________.

Given the distribution of grouped scores shown in the following table. N equals _______.

In a frequency distribution of grouped scores, all intervals should be of exactly the same width.

Given the distribution of grouped scores shown in the following table. How many occurrences fall below the upper real limit of the interval 70-79?

A researcher has collected some data on the amount of time in seconds (to the nearest 0.1 second) that it took trained rats to run through a maze. The data is shown below arranged in a frequency distribution of grouped scores. The cumulative percentage for the interval 5.2-5.5 is _________.

Assume the following are scores in a 100-point achievement test:

When constructing a distribution of grouped scores, the only requirement regarding the lower limit of the lowest interval is that the interval includes the lowest score in the distribution.

A stem and leaf diagram contains more information than a histogram.

Consider the following stem-and-leaf diagram. If the numbers in the left column are deciles, the median of the distribution falls in the range of _______.

Assume your task is to group the raw scores given below into a frequency distribution of approximately 12 intervals of equal width. The highest frequency for any interval is _________.

Interval or ratio data may be plotted as a _________.

Define percentile rank.