Garret thinks his car battery is becoming weak. He doesn't want to be stranded on the highway, so he tests his battery and it tests fine. But when Garret begins his trip on the highway, the battery dies 20 miles down the road. The test results must have been wrong! What type of error is this?

Type II error

Explanation:

A type II error is also known as a false negative and occurs when a researcher fails to reject a null hypothesis which is really false. Here a researcher concludes there is not a significant effect, when actually there really is.

The probability of making a type II error is called Beta (β), and this is related to the power of the statistical test (power = 1- β). You can decrease your risk of committing a type II error by ensuring your test has enough power.

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