Exam 3: Frequency Distributions

A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. Here is the frequency distribution of the data. The 50^th percentile point is _________.

A "U" shaped distribution is an example of a symmetrical distribution.

The range of a set of scores with a maximum value of 92 and a minimum value of 26 is _________.

A bell shaped curve is an example of a skewed distribution.

Given the distribution of grouped scores shown in the following table. What percentage of cases fall within the class interval containing the most cases?

Given the distribution of grouped scores shown in the following table. The 50th percentile point equals _________.

All frequency distributions should be of grouped scores.

Consider the frequency distribution shown in the table below.

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

You have just been hired as a statistician by the federal government. Your first assignment is to prepare a graphic representation of the number of types of animals in a certain national forest. You are told there are 525 birds, 100 beavers, 150 bears, 300 deer, 250 elk, 400 squirrels, 600 rabbits, and 200 geese. Prepare a graph to show these data.

A psychologist is interested in the social interactions of preschool children. She measures the number of verbal interactions that each child at a preschool engages in during a day. The resulting data are shown in the following frequency distribution. The relative frequency for the interval 76-85 is _________.

Given the frequency distribution of grouped scores shown in the table below, determine the percentile rank of a score of 41. Please show all work.

Given the distribution of grouped scores shown in the following table. How many occurrences are there for the interval 60-69?

If i = 7, the scores are integer, and the minimum value of the distribution of scores is 8, what would the lowest class interval be?

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 real limits of the interval 6.4-6.7 are _________.

In a frequency distribution the more intervals the better, regardless of whether some intervals have zero frequency.

Define percentile point.

Assume the following are weights of a sample of junior high school students.

The purpose of a frequency distribution is to _________.

If the range of a distribution were 89 and the data were reported as whole numbers, what would the width of the class interval be if one chose to group the distribution into approximately 14 class intervals?