# Lesson 3

Associations and Relative Frequency Tables

• Let’s explore relative frequency tables

### 3.1: Estimation

What percentage of the graph is labeled C?

1. Record an estimate that is:
too low  about right   too high

2. Explain your reasoning.

### 3.2: Relative Frequency Tables

The relative frequency tables display data collected from 230 students.

1. 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%
1. What percentage of students participate in after-school activities? How many students participate in after-school activities?
2. What percentage of students arrive home 2 or more hours after dismissal? How many students arrive home 2 or more hours after school dismissal?
2.  aspiring professional athlete  aspiring STEM career  total
prefer physical education 77% 23% 100%
prefer math  18% 82% 100%
1. What percentage of students who prefer math aspire to have a career in STEM?
2. What percentage of students who prefer physical education aspire to have a career in STEM?
3. Are these two percentages close?
4. Is there evidence of an association between students’ career aspirations and subject preference? Explain your reasoning.