# In a frequency polygon the points are plotted over

Question 1

5 out of 5 points

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In a frequency polygon the points are plotted over _______ at a height corresponding to the frequency of the interval.

Question 2

0 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 3

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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 75th percentile point is _________.

Question 4

5 out of 5 points

The true limits of 7.0 are _________.

Question 5

0 out of 5 points

If a large psychology class took a test on theoretical biophysics, the distribution of scores would probably be _________.

Question 6

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Given the distribution of grouped scores shown in the following table. The cumulative frequency of 115 indicates that 115 scores fall below _______.

Question 7

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

If the numbers in the left column are deciles, the median of the distribution falls in the range of _______.

Question 8

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 9

5 out of 5 points

The distribution of scores of high school seniors on a sixth grade math test would probably be _________.

Question 10

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A distribution which has a predominance of scores at the lower values of the distribution and which tails off at the higher end is _______.

Question 11

0 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 lowest class interval is _________.

Question 12

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 real limits of the interval 6.4-6.7 are _________.

Question 13

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In graphing frequency distributions, _________ is usually plotted on the abscissa.

Question 14

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 15

5 out of 5 points

If a curve is symmetrical, _________.

Question 16

0 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 % for the interval 46-55 is _________.

Question 17

0 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. The resulting data are shown in the following frequency distribution.

The relative frequency for the interval 76-85 is _________.

Question 18

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 percentage for the interval 5.2-5.5 is _________.

Question 19

0 out of 5 points

Your new Mercedes weighs 1850 kilograms when measured to the nearest kilogram. The real limits of its weight are _________.

Question 20

5 out of 5 points

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