Decrease P(Type I error) and increase P(Type II error). Smaller α means a smaller rejection region; this lowers Type I error but increases Type II error.

Increase both Type I and Type II errors.

Have no effect on Type II error.

Decrease both Type I and Type II errors.

Decrease P(Type I error) and increase P(Type II error).

Potential Errors When Performing Tests

AP Statistics· difficulty 3/5

A statistician decreases α from 0.05 to 0.01.

Decreasing α will:

A
$Increase both Type I and Type II errors.$
B
$Have no effect on Type II error.$
C
$Decrease both Type I and Type II errors.$
D
$Decrease P(Type I error) and increase P(Type II error).$
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Explanation

Smaller α means a smaller rejection region; this lowers Type I error but increases Type II error.

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