Samples and Population Math

Which data set shows students who tend to spend more time on homework per week?

• Finn's Data Set

• Jonah's Data Set

How do you find the interquartile range (IQR) of a data set?

• The IQR is equal to the median.

• Q3 - Q1 = IQR

• Maximum value - Minimum Value = IQR

• You find the two numbers in the middle and get the average of them.

Data about the average book prices from two bookstores specializing in rare books is shown. What conclusion is true about the data?

• Bookstore A has a lower median value.

• Bookstore B has a higher median value.

• Bookstore A has less variance in their prices.

• Bookstore B has less variance in their prices.

The principal at Key North Middle School wants to determine if the 85 students in the 7th grade prefer to collect bottles or sell magazines as their year-end trip fundrasier. Select ALL the sets of people that could be a representative sample of the population.

• 10 sixth-grade students, 10 seventh-grade students, 10 eighth-grade students

• 40 students from the school

• 30 seventh-grade students

• 10 seventh-grade boys and 10 teachers

• 15 seventh-grade boys and 15 seventh-grade girls

Tags

7.SP.1

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.

What is the range of the data shown?

• 85

• 90

• 80

• 70

Which student has the greater range of test scores?

• Amy

• Ed

What is the best measure of center for this data set:

• mean

• median

• mode

• average

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

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