Samples and Population Math

Keyli gathers the heights of a random sample of six graders and seventh graders and displays the data in box plots. What can she say about the data sets?

• The 6th grade sample has greater variability.

• The 7th grade sample has greater variability.

• The 6th grade sample has the greater median.

• The ranges are equal for both samples.

Mr. Jackson had students grow the same type of plant in two different rooms to test the growing conditions. The results are shown in the box plant. Choose ALL true statements below.

• Room 7G has the tallest plant.

• 75% of 7D plants are 8 in. or taller.

• 7G has a greater median height.

• Room 7D has the shortest and tallest plants.

Kerron gathers the heights of a random sample of 6th graders and 7th graders and displays the data in box plots. Which statement below is true?

• The median of the 7th grade sample is greater than the 6th grade sample.

• The 7th grade sample has greater variability.

• The ranges of both data samples are equivalent.

• The median of the 6th grade sample is greater than the 7th grade sample.

Mykel surveyed 15 7th graders and 15 8th graders at his school to see how many hours they spend per day listening to music. He made two box plots to compare the data sets. What inference can he draw from the data sets?

• The range is greater for the 8th graders, so there is greater variability for the 8th graders than the 7th graders.

• The person who listens to music the least is a 7th grader.

• The median is greater for the 7th graders, so they generally spend more time listening to music than 8th graders.

• No inferences can be made from the box plots.

Find the MAD for the following set: 85, 90, 68, 75, 79

• 79.4

• 6.48

• 32.4

• 79

Find the Mean Absolute Deviation:  10, 9, 3, 8, 10.  The Mean is 8

• 3

• 5

• 1

• 2

Determine the mean absolute deviation of the data.
9, 7, 11, 10, 8

• 9

• 6

• 1.2

• 5

Find the Mean Absolute Deviation: (MAD)

10, 9, 3, 8, 10.

• 3

• 5

• 1

• 2

Two classes of students took the same math test. The two box plots show a summary of their results rounded to the nearest whole number.

Class A's MAD is 2.3 and Class B's MAD is 2.8.

Which class' results were the least variable?

• Class A

• Class B

The box plots show the age of film viewers in years for three different film. Film A's MAD: 5.4 Film B's MAD: 3.4 Film C's MAD: 2.4 Which film has the most variability for it's viewers age?

• Film A

• Film B

• Film C