Eqn 22-23: Y 0.54x+ 35, R2 30.28 22. In Eqn 22-23, what is the predicted outcome
ID: 3227213 • Letter: E
Question
Eqn 22-23: Y 0.54x+ 35, R2 30.28 22. In Eqn 22-23, what is the predicted outcome for an individual with a measured value of 10?: a. 49.3 b. -49.3 40.4 d. 40.4 23. In Eqn 22-23, what is the proportion of variance accounted for by the linear regression? a. 0.28 b. 0.53 c, 0.54 d. 2.50 24. What is one way to help remove unwanted bias in an experiment?: a. Pay subjects very well b. Sort subjects into groups based on hair color c. Have the experimenter pick each subject individually d. Randomization 25. Which of the follow groups represents a vulnerable population?: a. Prisoners b, Terminally ill patients c. Students d. All of the aboveExplanation / Answer
the regression equation is givcen as Y=0.54x+35 with R2=0.28
22) so predicted outcome for an individual when x=10 is
Y=0.54*10+35=5.4+35=40.4 [option d]
23) R2 measures how well is the regression equation.
it measures the amount of variability in Y explained by the regression equation.
R2=0.28
so proportion of variance accounted for by the linear regression is 0.28 [option a]
24. unwanted bias appears in an experiment due to subjectivity.
to remove the bias we need a good estimator and for good estimator we must select the sample in a random manner.
hence the correct way to remove bias is RANDOMIZATION [option d]
25. answer is Terminally ill patients because they are subjected to risk more than the others
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