Statistics Review

1. Lily is trying to see what is the most popular flower among the 750 students in her school.  She asks a sample of 50 students.  

          What is the population of her study?

• The 50 random students.

• The 750 students in the school.

• The 30 teachers in the school.

• The people who picked roses.

2. In a random sample Micah found that 5 out of 20 in his class failed the vocabulary quiz.  If he used his sample to make a prediction about the number of 7th graders who failed out of 150 total 7th graders, how many should he predict?

• About 150 students

• About 50 students

• About 38 students

• About 5 students

3. Jasmine wants to research the popularity of various Girl Scout cookies in her neighborhood. 

Which of the following methods could she use to generate a representative sample?

SELECT ALL THAT APPLY

• Assign each house a number and use a random number generator to produce a list of houses for the sample.

• Choose every house that has at least three trees in the yard.

• Choose only the houses of people you know.

• List the houses on slips of paper and draw 20 from a hat.

• Choose all the houses that have a garage.

What is the range of the data for teachers?

What is the MEAN of the data in the dot plot? (Round to the nearest tenth.)

What is the MEDIAN of the data in the dot plot?

Based on the box plots, which group of students generally scored higher on their math test?

• Morning

• Afternoon

• Evening

• Midnight

What is the MEDIAN of the students that took the test in the afternoon in the sample?

What percentage of morning students did better than all the afternoon students?

• 0%

• 25%

• 50%

• 75%

The dot plots show the number of hours per week that each middle school spends reading. Based on the data, which school spends MORE TIME reading?

• School A

• School B

• School C

• Can't tell from this data