BSTweek4assign - BST 322 Week 4 Assignment 1 For each...

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BST 322 Week 4 Assignment 1. For each correlation coefficient below, calculate what proportion of variance is shared by the two correlated variables: a. r = 0.25
b. r = 0.33 r = 0.90
c. r
d.
2. For each coefficient of determination below, calculate the value of the correlation coefficient: a. r 2 r 2
b.
c. r 2 r 2 = 0.07
d.
3. Suppose a researcher regressed surgical patients’ length of stay (dependent variable) in the hospital on a scale of functional ability measured 24 hours after surgery. Given the following, solve for the value of the intercept constant and write out the full regression equation given: Mean length of stay = 6.5days ( Y= outcome variable) Mean score on the functional ability scale = 30 (x= actual value of variable x) Slope of the regression equation = -0.10 (b= slope of the line (regression coefficient)) a. Solve the equation Y= a +bX
b. Write out the full regression equation Y= 9.5 + (-0.10)(x)
4. Now using the regression equation that was calculated in Exercise 3, compute the predicted value of Y (the length of the hospital stay) for patients with the following functional ability scores measured 24 hours after surgery: a. 42
b. 68 25
c.
d. 10
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