Correlations

Question 1

what are the common uses of correlational method?

Answer 1

• measuring reliability and validity in a study
• assesses concordance rated of twin studies
• relationship between change thats already occurred
• relationship between 2 variables that would be unethical to manipulate

Question 2

what does correlational research refer to?

Answer 2

both vr=ariables are measures to there is no manipulated variable

Question 3

what are the different types of correlation?

Answer 3

• positive
• negative
• curvilinear
• no correlation

Question 4

what is a positive correlation?

Answer 4

2 variables increase/decrease together
I /
I /
I/____

Question 5

what is a negative correlation?

Answer 5

as 1 variable increases the other decreases
I \
I \
I____

Question 6

what is a curvilinear correlation?

Answer 6

correlation may begin as positive relationship and then change to become negative or vice versa
(U/inverted U shape)

Question 7

what will be shown on a graph if there is no correlation?

Answer 7

random scatter of results

Question 8

how do you display correlational data?

Answer 8

scattergram/scatterplot

Question 9

what is a scattergram/scatterplot?

Answer 9

• used to display data, indicated if there is a correlation
• makes outliers identifiable
• more linear shape plotted the stronger the correlation

Question 10

what is the correlation coefficient (r)?

Answer 10

• measures strength and direction of data
• strength of correlation is indicated by value of r which ranges from 0-1
• 0 = no relationship, 1 = very strong relationship
• larger correlation coefficient, more statistically significant

Question 11

what is the direction of the correlation coefficient indicated by?

Answer 11

whether value of r is positive or negative (correlation)

Question 12

what is the statistical significance of the correlation coefficient determined by?

Answer 12

size of correlation coefficient and size of sample in the study