Hypothesis testing

Front

Define a Type I error.

Back

Rejecting a true null hypothesis.

Front

What is the null and alternate hypothesis if the average weight of a 6th grade student's backpack is 18.4 lbs and the principal thinks it does not weigh 18.4 lbs?

Back

H₀ = 18.4, Hₐ ≠ 18.4.

Front

What are the null and alternative hypotheses for a part that is supposed to weigh 19 pounds?

Back

H₀ : μ = 19, Hₐ : μ ≠ 19.

Front

When do you use a t-value instead of a z-value?

Back

When n < 30.

Front

What is a null hypothesis?

Back

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

Front

What is an alternative hypothesis?

Back

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

Front

What does it mean to reject the null hypothesis?

Back

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

Front

What is a p-value?

Back

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

Front

What is the significance level (alpha)?

Back

The threshold for determining whether to reject the null hypothesis, commonly set at 0.05.

Front

What is a Type II error?

Back

Failing to reject a false null hypothesis.