# Chapter 21.docx - Chapter 21 More About Tests Statistically...

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Chapter 21: More About Tests Statistically significant – P-value falling below alpha level o Alpha level – aka significance level When we reject the null hypothesis, we say that the test is “significant at that level” Two-sided: Alpha level = 100 – Confidence % One-sided: Alpha level = ½ (100 – Confidence%) When we perform a hypothesis test, we can make mistakes: Type I error – the null hypothesis is true, but we mistakenly reject it; false positive in medical disease testing o Probability of this error is alpha Type II error – the null hypothesis is false, but we fail to reject it; false
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