probability and significance

• significance is a statistical term which lets us know how sure we are about a correlation or difference existing
• if significant we reject the null hypothesis and accept alternative hypothesis
• probability is a calculation of how likely it is that even will happen
• 0 = statistical impossibility
• 1 = statistical certainty
• type 1 error - incorrect rejection
• type 1 - false positive
• type 2 = failure to reject the null which is false
• type 2 - false negative