T10 Correlation

"In the world of correlation, we examine the effect of ___________."

Please fill in the blank.

In theory, can we draw causal conclusion with correlation?

• Yes

• No

What is the suitable measurement for the correlation between two continuous variables?

• Pearson's correlation

• Spearman correlation

• Partial correlation

What is the range for Pearson correlation coefficient?

• from 0 to 1

• from 1 to 10

• from 0 to 100

• from -1 to 1

Which correlation is the strongest?

• GPA and Smartphone

• GPA and Chocolate

• Smartphone and Chocolate

Which two pairs of variables have opposite-direction relationships?

• Smartphone and Chocolate

• GPA and Chocolate

• GPA and Smartphone

If we want to see whether there is a significant correlation between two variables, which test should we use?

• z-test

• t-test

• ANOVA

If we do hypothesis testing for correlation, what are the null and alternative hypotheses?

• H0 : r = 0 ; H1 : r ≠ 0

• H0: μ1 = μ2 ; H1: μ1 ≠ μ2

• H0 : ρ = 0 ; H1 : ρ ≠ 0

• H0: μ = 0 ; H1: μ ≠ 0