probability and significance Flashcards
What does probability mean?
Measure of likelihood that a particular event will occur where 0 indicates statistically impossible and 1 statistically certainty
What does significance mean?
Statistical term that tells how difference or correlation exists
What does a significant result mean?
Reject the null hypothesis
What is critical value?
The numerical boundary between acceptance and rejection of the null hypothesis
What is a type 1 error?
The incorrect rejection of true null hypothesis (false positive)
Too lenient
What is a type 2 error?
The failure to reject a false null hypothesis (a false negative)
Too strict
What is the null hypothesis?
States there is ‘no difference’ between the condition
What does the statistical test determines?
Hypothesis is ‘true’ and thus whether we accept or reject the null hypothesis
What is the usual significance used in psychology?
0.05 or 5%
How do you know when a statistical test is significant or not?
The rule of R
-The statistical test with the letter ‘R’ in the name the calculated value must be equal to or more than the critical value
