Self Check Exercise

Revise Your Work

Step 1: Work Time

Revise Your Work

Work with your partner to revise your work on the Self Check problem based on the previous questions and feedback from your partner.

Self Check Problem

A school has 10 seventh grade classes, each with 30 students. Lucy wants to find out how well the students can estimate the weight of a gallon of water. She realizes that she cannot survey everyone, but she isn’t sure how to proceed.

  1. How could Lucy go about collecting her data? Lucy decides to start with a random sample of 10 seventh grade students. The students made the following estimates for the weight of a gallon of water (in pounds): 6, 7, 9, 8, 7, 10, 8, 6, 9, 8
  2. Based on this sample, what does a typical seventh grade student at the school think a gallon of water weighs?
  3. How did you reach your conclusion?
  4. Based on the sample, how many seventh grade students at the school think that a gallon of water weighs between 7 and 9 lbs?

Step 2: Work Time

Challenge Problem

  • Create a data set for a different group of 10 students such that the data set has a lower mean, a greater range, but the same median.
  • Compare your data set with that of another student. How are the data sets the same? How are they different?