Various Tests

Question 1

t-test

Answer 1

Checks differences between *means of *2 groups

“Tea is meant for 2”

EX: comparing the mean blood pressure between men and women.

Question 2

ANOVA

Answer 2

Checks differences between *means of *3 or more groups

“3 words: ANalysis Of VAriance”

EX: comparing the mean blood pressure between members of 3 different ethnic groups

Question 3

Chi-square (χ²)

Answer 3

Checks differences between *2 or more *percentages or proportions of *categorical
outcomes (not mean values)

Pronounce “Chi-tegorical”

EX: comparing the percentage of members
of *3 different ethnic groups who have essential hypertension

Question 4

Pearson correlation coefficient (r)

Answer 4

r is always between −1 and +1. The closer the absolute value of r is to 1, the *stronger the linear correlation between the 2 variables

Positive r value–>positive correlation (as one variable INC, the other variable DEC)

Negative r value–>negative correlation (as one variable INC, the other variable DEC)

Coefficient of determination = r 2 (value that is usually reported).