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Chapter 7 Review Questions

# Chapter 7 Review Questions - increase the Y scores tend to...

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Shawnae Cristobal Statistics Professor DeNike October 3, 2008 Box #283 Chapter 7: Review Questions Page 166 #s 1,5,7,9,11 1. (a) in experiments the researcher manipulates one variable and measures participants on another variable; in correlational studies the researcher measures participants on two variables. (b) in experiments researchers compute the mean of the dependent, Y, scores for each of the independent variable, X; in correlational studies the researcher examines the relationship over all X-Y pairs by computing a correlation coefficient. 5. (a) a scatterplot is a graph of the individual data points formed from a set of X-Y pairs. (b) a regression line is the summary straight line drawn through the center of the scatterplot 7. (a) as the X scores increase the Y scores tend to increase (b) as the X scores
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Unformatted text preview: increase the Y scores tend to decrease (c) as the X scores increase the Y scores do not only increase or decrease 9. (a)particular Y scores are not consistently paired with particular X scores (b) the variability in Y at each X is equal to the overall variability in all Y scores in the data (c) the Y scores are not close to the regression line (d) knowing X does not improve accuracy in predicting Y 11. (a) ρ stands for the Pearson correlation coefficient in the population (b) ρ is estimated from an r calculated on a random sample (c) ρ indicates the strength and type of linear relationship found between X and Y scores in the population....
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