Author Question: Multiple Regression Analysis results tell the researcher two things, the percentage of prediction ... (Read 49 times)

j.rubin · **on:** Jul 13, 2018

Multiple Regression Analysis results tell the researcher two things, the percentage of prediction accuracy and

A) length of time to calculate. B) standard deviation.
C) scattergram accuracy. D) size and direction of effects.

Question 2

A health psychology student wanted to know if giving an electric shock to participants each time they inhale from a cigarette will reduce how deeply they inhale.

She arranges for smokers to be randomly assigned to two groups: the first group receives no shock and the second group a painful shock for each puff. Some participants quit the experiment, mostly from the painful-shock group. At the end, there was no difference between the two groups on depth of inhaling. Which of the following is a correct conclusion?

a. electric shock has no effect on depth of inhalation.
b. the study is confounded by differential attrition.
c. the study is confounded by selection bias.
d. the study was confounded by regression artifact.