Chapter 4 Homework Research Methods

Chapter 4 Homework: Correlation and Prediction
Your answers should be typed.
Please attach your hand written calculations on a separate sheet(s).

14.
Predicted VO2 = 30 +1 × (X), where X is the time in minutes to complete a 1.5-mile run and the SEE is 5 ml/kg/min. VO2= 30+1(8) VO2=38
If John runs the 1.5-mile run in 8 minutes, what is his predicted VO2?

22, Define the terms positive correlation and negative correlation. What is the difference? Give an example of each. Positive correlation is a relationship of two variables in which as the value of one increases or decreases the other does the same. (The amount of playing time to the number of injuries) Negative correlation is the relationship of two variables in which as the value of one increases or decreases the other does the opposite. (the amount of water drank to the number of heat illness cases)

M1
M2
M3
M4
M5
M6
M7
M1
1.00

M2
– .758
1.00

M3
.683
– .536
1.00

M4
– .051
.182
.356
1.00

M5
.372
– .561
.265
.071
1.00

M6
.055
.167
– .645
– .005
.461
1.00

M7
– .343
.610
– .984
– .252
– .184
– .259
1.00

34. a)
i) Which two variables in the above table have the STRONGEST correlation (This means only ONE coefficient)? (M7&M3, -.984) ii) Why did you select it? This is the number closest to 1 or negative 1 iii) Identify whether it is a positive or negative relationship. It is a negative relationship
b)
i) Which two variables in the above table have the WEAKEST correlation (This means only ONE coefficient)? (M6&M4, -.005) ii) Why did you select it? This is the number furthest from 1 or -1 iii) Identify whether it is a positive or negative relationship. This is a negative realtionship