Analyzing Dot Plots

Question 1

There are twenty classes at Northwestern Middle School and twenty classes at Southeastern Middle School. The number of students in each class at each school is shown in the dot plots below.Number of Students in Each Class at Northeastern Middle School Number of Students in Each Class at Southeastern Middle SchoolMichela says that the modes of the two data are the same so the median and mean must also be the same. What is Michela’s error?

Revolt · Accepted Answer

The means and medians are not the same.

Question 2

A survey of a group of seventh graders and a group of teachers at a local middle school asked how many siblings they each have. The dot plots below show the results.StudentsTeachersWhich compares the modes of the data?

Revolt · Accepted Answer

The mode for the students is 2 and the mode for the teachers is 4.

Question 3

A survey of a group of seventh graders and a group of teachers at a local middle school asked how many siblings they each have. The dot plots below show the results.StudentsTeachersWhich compares the medians of the data?

Revolt · Accepted Answer

The median for the students is 2 and the median for the teachers is 3.

Question 4

The dot plots below show the test scores of the seventh-grade students and the fifth-grade students at a local school.Seventh-Grade and Fifth-Grade Students’ Test ScoresWhich statement compares the shape of the dot plots?

Revolt · Accepted Answer

Only the fifth-grade data points are distributed fairly evenly.

Question 5

There are twenty classes at each of two middle schools. The number of students in each class at each school is shown in the dot plots below.Number of Students in Each Class at Poplar Middle School Number of Students in Each Class at Oak Middle SchoolWhich statement correctly compares the mean number of students for the data in the plots?

Revolt · Accepted Answer

There are about 2 more students in each class at Oak Middle School than at Poplar Middle School.

Question 6

The dot plots show the number of hours a group of fifth graders and seventh graders spent playing outdoors over a one-week period. Time Spent Playing Outdoors for Fifth Graders and Seventh GradersWhich statement correctly compares the shape of the data in the plots?

Revolt · Accepted Answer

In the seventh-grade data, the left side of the data looks similar to the right side, but not in the fifth-grade data.

Question 7

A survey of a group of seventh graders and a group of teachers at a local middle school asked how many siblings they each have. The dot plots below show the results.StudentsTeachersWhat is closest to the difference between the means of the two dot plots?

Revolt · Accepted Answer

1.5

Question 8

The heights of a group of boys and girls at a local middle school are shown on the dot plots below. When comparing the shapes of the two sets of data, what conclusion can someone draw?

Revolt · Accepted Answer

The girls are generally taller than the boys.

Question 9

Renita analyzed two dot plots showing the snowfall during the winter months for City A and for City B. She found that the median snowfall is 5 inches less in City A than in City B and the mean snowfall is about 2 inches less in City A than in City B. Which explains why there is a difference in the measures of center for the sets of data?

Revolt · Accepted Answer

One set of data has more variation than the other.

Question 10

The amount that two groups of students spent on snacks in one day is shown in the dot plots below.Group AGroup BWhen looking at the differences in the statistical measurements of Group A and Group B, which differences have a value of $1 or less?

Revolt · Accepted Answer

the mean and the median

Analyzing Dot Plots Answers

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