Stats Review Unit 4 Hypothesis Testing and such....

Front

The symbol for the sample proportion is __________.

Back

p̂

Front

What is the degrees of freedom equal to?

Back

n-1

Front

A z distribution would be the same as a t distribution with how many degrees of freedom?

Back

infinite

Front

What is the purpose of hypothesis testing in statistics?

Back

To determine if there is enough evidence to reject a null hypothesis.

Front

Define null hypothesis (H0).

Back

A statement that there is no effect or no difference, and it is the hypothesis that the test aims to assess.

Front

Define alternative hypothesis (H1).

Back

A statement that indicates the presence of an effect or a difference.

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 does a p-value represent in hypothesis testing?

Back

The probability of obtaining test results at least as extreme as the observed results, assuming the null hypothesis is true.

Front

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

Back

The threshold for rejecting the null hypothesis, commonly set at 0.05.