Workbook 2- Correlation And Regression

Question 1

Correlation Graph Y&X Axis

Answer 1

Y-Axis: Independant Variable
X-Axis: Dependant Variable

Question 2

Regression Line

Answer 2

Line of best fit

Question 3

Product Moment Correlation Coefficient- PMCC (r)

Answer 3

Provides info on the type and strength of correlation (eg -1 is perfectly negative, 1 is perfectly positive and 0 is no correlation)

Question 4

Interpolation

Answer 4

Using the regression line to make predictions which fall within the range of the observed data, stronger the correlation the more reliable this prediction

Question 5

Extrapolation

Answer 5

Making predictions outside of the range of observed data, unreliable as no evidence of the pattern of data continuing beyond the range

Question 6

Causal Correlation

Answer 6

When a change in one variable does affect the other

Question 7

Spurious Correlation

Answer 7

Correlation without a causal connection

Question 8

Steps to Hypothesis Testing with Correlation

Answer 8

1. Hypotheses
2. Data
3. Critical Region
4. Compare
5. Conclusion

Question 9

One Tail Test Hypothesis

Answer 9

H0: p = 0
H1: p<0 or p>0

Question 10

Two Tail Test Hypothesis

Answer 10

H0: p=0
H1: p=’0