A researcher studying the relation of length of court trials to length of time for juries to come to a decision reports the following results for the first four trials considered
M = 8.75 SD = 6.83 M = 7.5 SD = 2.96 r = .91
a. Give the Z score prediction formula for predicting length of jury deliberation from length of trial.
b. Predict the hours of deliberation for a jury where the trial lasted for 10 days.
c. Explain what you have done to a person who is familiar with correlation but not with regression.
What will be an ideal response?
a. Predicted ZY = (.91 )(ZX).
b. ZX = (10 ??8.75 )/6.83 = .18; Predicted ZY = (.91 )(.18 ) = .16
Predicted Y = 7.5 + (.16 )(2.96 ) = 7.97 hours.
c. Answers will vary
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