Algebra 1 | Unit 3 | Lesson 9: Causal Relationships | Practice Problems

Priya creates a scatter plot showing the relationship between the number of steps she takes and her heart rate. The correlation coefficient for the data is 0.88. Are they correlated? Explain your reasoning.

• Yes, they are strongly correlated.

• No, they are not correlated.

Do either of the variables cause the other to change? Explain your reasoning.

Kiran creates a scatter plot showing the relationship between the number of students attending drama club and the number of students attending poetry club each week. The correlation coefficient for the data is -0.36. Are they correlated? Explain your reasoning.

• Yes, they are correlated.

• No, they are weakly correlated.

Do either of the variables cause the other to change? Explain your reasoning.

A news website shows a scatter plot with a negative relationship between the amount of sugar eaten and happiness levels. The headline reads, “Eating sugar causes happiness to decrease!” What is wrong with this claim?

What is a better headline for this information?

Prefer writing notes by hand	Prefer typing notes	Don't take notes
Study for less than 1 hour	22		8
Study for 1 hour or more	38	28	3

How many students prefer typing notes and study for less than 1 hour?

• 20

• 26

• 22

• 30

Tags

From Unit 3, Lesson 1

Tags

From Unit 3, Lesson 8

Technology required. Use a graphing calculator to answer the questions. What is an equation of the line of best fit? What is the value of the correlation coefficient?

Tags

From Unit 3, Lesson 8