# Inference comparing two groups or populations

### Learn

### Practice

Conditions for inference on two proportionsGet 3 of 4 questions to level up!

Two-sample z interval for the difference of proportionsGet 3 of 4 questions to level up!

### Learn

### Practice

Writing hypotheses for testing the difference of proportionsGet 3 of 4 questions to level up!

Test statistic in a two-sample z test for the difference of proportionsGet 3 of 4 questions to level up!

P-value in a two-sample z test for the difference of proportionsGet 3 of 4 questions to level up!

Making conclusions about the difference of proportionsGet 3 of 4 questions to level up!

### Learn

### Practice

Conditions for inference on two meansGet 3 of 4 questions to level up!

Two-sample t interval for the difference of meansGet 3 of 4 questions to level up!

### Learn

### Practice

Writing hypotheses to test the difference of meansGet 3 of 4 questions to level up!

Test statistic in a two-sample t testGet 3 of 4 questions to level up!

P-value in a two-sample t testGet 3 of 4 questions to level up!

Making conclusions about the difference of meansGet 3 of 4 questions to level up!