Potential Errors When Performing Tests

AP Statistics· difficulty 2/5

A pharmaceutical company tests H₀: drug is ineffective vs Hₐ: drug is effective.

What is a Type II error in this context?

A
$Concluding the drug is effective when it actually is effective.$
B
$Concluding the drug is ineffective when it actually is ineffective.$
C
$Concluding the drug is ineffective when it actually is effective.$
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D
$Concluding the drug is effective when it actually is ineffective.$

Explanation

Type II error = failing to reject a false H₀. Here: failing to detect a real effect.

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