Inferential Statistics

Question 1

What is probability?

Answer 1

the likliehood of an event or patten of numbers occurring due to chance

Question 2

What do Psycholgists say about probability?

Answer 2

as a general rule they need to stick with number of 95%

If their results come out significant they will say they’re 95% confident their results are NOT down to chance

Question 3

Which P value do most psychologists use?

Answer 3

P < 0.05 the results being down to chance is less than 5%

Question 4

What does it mean if the results have come out significant?

Answer 4

There is an actual difference or relationship in the data

Question 5

What’s one problem with psychological research?

Answer 5

We can’t prove anything.

We can be certain our results aren’t down to chance but not 100%

Question 6

What is the variance?

Answer 6

measures how much a set of values are spread out

Question 7

How do you calculate the variance?

Answer 7

Work out mean for each condition

for each value subtract the mean from the score

Square each result to give a squared difference

work out the mean for all those squared differences

Question 8

What is the critical value?

Answer 8

You use a table of critical values and the number will depend on things like how many P’s you used