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all quizzes til exam 2 - CHAPTER 6 A scatter plot Student...

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CHAPTER 6 A scatter plot ____.   Student Response Correct Answer 1.  must be linear    2.  is a frequency graph of X values    3.  has to do with electron scatter    4.  is a graph of paired X and Y values    Score: 1/1    2.   If a relationship is linear, ____.   Score: 1/1    3.   In the equation, Y = bX + a , X and Y are ____.
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  Score: 1/1    4.   In an imperfect relationship, ____.   Score: 1/1    5.   The closer the points on a scatter diagram fall to the regression line, the ____ between the scores.  
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  Score: 1/1    6.   Y can be most accurately predicted from X if the correlation between X and Y is ____.   Score: 1/1    7.   If the correlation between two variables is - 1.00 and the score of a given individual is 2.20 standard deviations above the mean on one of the variables, we would predict a score on the second variable of ____.  
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  Score: 1/1    8.   When a correlation exists, lowering the range of either of the variables will ____.   Score: 1/1    9.   Exhibit 6-2 A researcher wanted to know if the order in which runners finish a race is correlated with their weight. She conducts an experiment and the data is given below. Finishing order Weight (lbs) Refer to Exhibit 6-2. What is the appropriate correlation coefficient for this data?
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  Score: 1/1    10.   Exhibit 6-2 A researcher wanted to know if the order in which runners finish a race is correlated with their weight. She conducts an experiment and the data is given below. Finishing order Weight (lbs) For the data in Exhibit 6-2, the correlation equals ____.   Score: 0/1   
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11.   If N is small, an extreme score ____.   Score: 1/1    12.   What is the slope for the points X 1 = 30, Y 1 = 50 and X 2 = 25 and Y 2 = 40?   Score: 1/1    13.   You have conducted a brilliant study which correlates IQ score with income and find a value of r = 0.75. At the end of the study you find out all the IQ scores were scored 10 points too high. What will the value of r be with the corrected data?
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  Score: 0/1    14.   If one calculates r for raw scores, and then calculates r on the z scores of the same data, the value of r will ____.   Score: 1/1    15.   If 49% of the total variability of Y is accounted for by X , what is the value of r ?  
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  Score: 1/1    16.   What is the value of r for the following relationship between height and weight? Height Weight   Score: 1/1    17.   For the following X and Y scores, how much of the variability of Y is accounted for by knowledge of X ? Assume a linear relationship. X Y
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  Score: 1/1    18.   What is the value of the Spearman rank order correlation coefficient (rho) for the following pairs of ranks?   Score: 1/1    19.   In order to properly use rho, the variables must be of at least ____ scaling.
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  Score: 1/1    20.   If a correlation is perfect,   Score: 1/1  CHAPTER 7 When the relation between X and Y is imperfect, the prediction of Y given X is ____.
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