Hypothesis Testing

Front

What is a null hypothesis (H0)?

Back

A statement that there is no effect or no difference, and it serves as the default assumption in hypothesis testing.

Front

What is an alternative hypothesis (H1)?

Back

A statement that indicates the presence of an effect or a difference, opposing the null hypothesis.

Front

Can the null and alternative hypothesis be the same?

Back

No, they represent mutually exclusive statements.

Front

What does it mean to 'reject the null hypothesis'?

Back

It means there is sufficient evidence to support the alternative hypothesis.

Front

What does it mean to 'fail to reject the null hypothesis'?

Back

It means there is not enough evidence to support the alternative hypothesis.

Front

What is a right-tailed test?

Back

A hypothesis test where the alternative hypothesis states that the parameter is greater than a certain value.

Front

What is a left-tailed test?

Back

A hypothesis test where the alternative hypothesis states that the parameter is less than a certain value.

Front

What is a two-tailed test?

Back

A hypothesis test where the alternative hypothesis states that the parameter is different from a certain value (either greater or less).

Front

How do you find a test statistic?

Back

Use a formula that relates the sample data to the population parameter.

Front

What is the significance level (α) in hypothesis testing?

Back

The probability of rejecting the null hypothesis when it is actually true, commonly set at 0.05 or 0.01.