Math Population Inferences

Compare the variability of the seventh and eighth grade data sets.

• The seventh grade is more variable because the interquartile range is larger than the eighth grade.

• The eighth grade is more variable because their quartile 2, 3 and 4 are less than the seventh grade.

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7.SP.3

Which inference can you make by comparing the measures of center?

• Every swimmer swam faster last year than they did this year.

• Most swimmers swam faster last year, on average, than they did this year.

• The swimmers swam faster this year, on average, than they did last year.

• Every swimmer swam faster this year than they did last year.

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7.SP.4

You are wanting to do a study on middle school math in Kansas. You sample students in Sedgwick, Johnson and Cherokee counties. Is your sample representative of the population?

• Yes

• NO

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7.SP.4

Mrs. Niles is doing a study about middle school mathematics at Galena Middle School. Find a sample representative of the population.

• people at Casey's

• 7th grade students in Mr. Van's class

• Liberty students

• citizens of Galena

The dot plot shows a random sample of the number of deer observed by 25 participants during a two-day hike. Which day showed more variability?

• Day 1

• Day 2

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7.SP.3

Carter's data comparing the growth of plants using fertilizer or not using fertilizer is shown in the box plots. Use the measures of center from the box plots to make an inference about the data.

• The plants that received fertilizer have a higher median, so they grew better overall.

• The plants that did not receive fertilizer had a larger interquartile range, so they grew better overall.

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7.SP.3

Annabel is comparing the distances that two electric cars can travel after the battery is fully charged. Use the measures of center to make an inference about the data. Fill in the blanks. __________can travel further than _______after the battery is fully charged.

• Car A, Car B

• Car B, Car A

• There are no inferences from this data

• Mrs. Bautch is the only one who knows this answer

What do the box plots tell you about the variability of the data?

• B has greater variability because its range and IQR are greater than A.

• B has greater variability because its median & mean are greater than A.

• A has greater variability because its range & IQR are greater than B.

• A has greater variability because its median and mean are greater than B.

Which student has the greater range of test scores?

• Amy

• Ed

Find the medians.
Science: _________ Math: __________ 

•  science: 4.5 h; math: 3 h

•  science: 3 h; math: 4.5 h

•  science: 5 h; math: 5 h

•  science: 3.5 h; math: 4 h