STATS 2 Flashcards
(11 cards)
What is Standard Error?
The average amount by which our estimate is likely to be wrong
What is the standard error of the mean?
SE of the mean tells us how unlike the population our sample is
What is SE inversely related to?
Sample size
What is a one-tailed hypothesis?
Specifies a direction. e.g. the mean of group 1 will be greater than the mean of group 2
What is a two-tailed hypothesis?
Does not specify a direction - e.g. there will be a significant difference between the mean of group 1 and 2
What is a null hypothesis?
No significant difference will be found!
What kind of hypothesis do inferential statistics address?
The null hypothesis!
What is a type 1 error?
Rejecting the null hypothesis when it should be accepted (False Positive)
What is a type 2 error?
Accepting the null hypothesis when it should be rejected (False Negative)
What does statistical significance tell us?
Whether the variance between two groups is greater than the variance within two groups - statistical significance never implies that two means differ substantially!
FORMULA’S FOR SE, POPULATION SD, POPULATION SE
FORMULA’S FOR SE, POPULATION SD, POPULATION SE
