AP Stats Chapter 9

Front

What is a P-value?

Back

The probability of obtaining the observed results (or more extreme) if the null hypothesis is true.

Front

What does it mean to reject the null hypothesis (H0)?

Back

It means that there is sufficient evidence to support the alternative hypothesis (Ha).

Front

What is the significance level (α)?

Back

The threshold for determining whether a P-value indicates statistical significance, commonly set at 0.05.

Front

What is the Power of a test?

Back

The probability that we correctly reject a false null hypothesis.

Front

What does it mean when a test is statistically significant?

Back

The test statistic had a P-value lower than the alpha level.

Front

What happens when the P-value is less than α?

Back

We reject the null hypothesis (H0).

Front

What happens when the P-value is greater than α?

Back

We fail to reject the null hypothesis (H0).

Front

What is a Type I error?

Back

Rejecting the null hypothesis when it is actually true.

Front

What is a Type II error?

Back

Failing to reject the null hypothesis when it is actually false.

Front

What is the null hypothesis (H0)?

Back

A statement that there is no effect or no difference, and it is the hypothesis that is tested.