Lesson 3
Associations and Relative Frequency Tables
 Let’s explore relative frequency tables
3.1: Estimation
What percentage of the graph is labeled C?
 Record an estimate that is:
too low about right too high  Explain your reasoning.
3.2: Relative Frequency Tables
The relative frequency tables display data collected from 230 students.

participates in afterschool activity no afterschool activity total arrives home within 2 hours of school dismissal 3% 40% 43% arrives home 2 or more hours after school dismissal 42% 15% 57% total 45% 55% 100%  What percentage of students participate in afterschool activities? How many students participate in afterschool activities?
 What percentage of students arrive home 2 or more hours after dismissal? How many students arrive home 2 or more hours after school dismissal?

aspiring professional athlete aspiring STEM career total prefer physical education 77% 23% 100% prefer math 18% 82% 100%  What percentage of students who prefer math aspire to have a career in STEM?
 What percentage of students who prefer physical education aspire to have a career in STEM?
 Are these two percentages close?
 Is there evidence of an association between students’ career aspirations and subject preference? Explain your reasoning.

9th grade 12th grade curfew 95% 90% no curfew 5% 10% total 100% 100%  Of the students in 12th grade, what percentage have a curfew?
 Of the students in 9th grade, what percentage have a curfew?
 Is there evidence of an association between students’ grade level and whether they have a curfew? Explain your reasoning.
3.3: Associate Your Variables
 Invent a pair of variables that you think will have an association. Explain your reasoning.
 Invent a pair of variables that you think will not have an association. Explain your reasoning.