Question 1
5 out of 5 points
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 50th percentile point is _________.
Question 2
5 out of 5 points
Assume your task is to group the raw scores given below into a frequency distribution of approximately 12 intervals of equal width.
The interval containing the most scores is _________.
Question 3
5 out of 5 points
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?
Question 4
5 out of 5 points
Given the distribution of grouped scores shown in the following table. What is the value of i?
Question 5
5 out of 5 points
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 frequency for the interval 6.0-6.3 is _________.
Question 6
5 out of 5 points
Given the distribution of grouped scores shown in the following table.
How many occurrences are there for the interval 60-69?
Question 7
5 out of 5 points
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?
Question 8
5 out of 5 points
Consider the following stem-and-leaf diagram.
1
2
2
1 3
3
2 4 6 7
4
2 3 5 6 8
5
1 3 4 4 5 6 8
6
3 3 3 5 6 7 8 8 9 9 9
7
2 2 2 3 3 4 5 5 5 6 6 7 7 7
8
1 1 1 2 3 3 4 4 5 5 5 6 6 6 6
9
2 2 2 3 3 4 4 5 5 5 6 6 7
This score distribution is _______.
Question 9
5 out of 5 points
When constructing bar graphs, the bars do not touch each other because _______.
Question 10
5 out of 5 points
Interval or ratio data may be plotted as a _________.
Question 11
5 out of 5 points
The purpose of a frequency distribution is to _________.
Question 12
5 out of 5 points
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 cumulative frequency for the interval 46-55 is _________.
Question 13
5 out of 5 points
Given the distribution of grouped scores shown in the following table. The percentile rank of a score of 41 equals _________.
Question 14
5 out of 5 points
A percentile point is defined as _________.
Question 15
5 out of 5 points
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 in the frequency distribution of grouped scores that follows.
The relative frequency for the interval 5.2-6.6 is _________.
Question 16
5 out of 5 points
Consider the following score diagram.
1
2
2
1 3
3
2 4 6 7
4
2 3 5 6 8
5
1 3 4 4 5 6 8
6
3 3 3 5 6 7 8 8 9 9 9
7
2 2 2 3 3 4 5 5 5 6 6 7 7 7
8
1 1 1 2 3 3 4 4 5 5 5 6 6 6 6
9
2 2 2 3 3 4 4 5 5 5 6 6 7
This score diagram is called a _________.
Question 17
5 out of 5 points
In a frequency polygon the points are plotted over _______ at a height corresponding to the frequency of the interval.
Question 18
5 out of 5 points
In graphing frequency distributions, _________ is usually plotted on the abscissa.
Question 19
5 out of 5 points
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?
Question 20
0 out of 5 points
Given the distribution of grouped scores shown in the following table. The 50th percentile point equals _________.
