Probability And Significance And Stats Test Flashcards
(15 cards)
What are the measures of central tendency and what do they do
Mean, median, mode and range. They tell us about genral patterns and trends between two conditions
What cants measures of central tendency do?
They cannot tell us whether its likely that the differences in the data were caused by the independent variable
What is probability
A way of assessing the likelihood that an event will/ will not occur
Can you say that something definitely will/ will not occur
NOOOOO!!!!
What is significance?
Allows us to establish whether to accept of reject our hypothesis.
What the P value
P<0.05 means that 95% chance that the results happened due to the manipulation of the IV, only 5% chance not
Why is the P value what is it
0.05 is the conventional level of probability to use in research. It’s the level at which we are satisfied that our results are unlikely to have been caused by chance factors
What is P for drug trials and why
<0.01, because they are more important and could have more serious consequences if wrong
What can you not get P<0
Cause we are working with humans who are unreliable
What are the levels of measurement
Nominal (categorical) data, ordinal, interval
What is nominal data?
Categories, groups Eg attachment type
What is ordinal data
Data ordered in some way eg least to most aggressive (done on a scale)
What is interval data
Data measured in units of equal intervals eg number of correct answers. Or numerical scales eg temp, height…
What is an unrelated design (test of difference)
Independent groups
What is a related design (test of difference)
Repeated measured and matched pairs
