Due to a lack of time and resources, Jeff's study only has statistical power of 0.3. Since his study is underpowered, he is likely to:
a. Make a Type I error, that is, to conclude that there is an effect when there actually isn't an effect.
b. Make a Type I error, that is, to conclude that there is no effect when there actually is an effect.
c. Make a Type II error, that is, to conclude that there is no effect when there actually is an effect.
d. Make a Type II error, that is, to conclude that there is an effect when there actually isn't an effect.
Answer: c. Make a Type II error, that is, to conclude that there is no effect when there actually is an effect.
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