Test# 2: Name: Class ED-500-Introduction to Statistics Direction: Please circle

Question

Test# 2: Name: Class ED-500-Introduction to Statistics Direction: Please circle the alphabet that describe your firial answer to the questions 14) All of the following are reasons why Z scores are used to help correlation EXCEPT determine the degree of lincar B Teores give a standard indication of just how high or low each score iser if there is a positive correlationucts of Z scores gives you a large positive number if there is a positive C) Because of the nature scores, the negative number if there is a negative correlation. re of Z scores, the cross-product will be positive in all cases compare scores on different measures. D) Using Z scores allows you to 15) For a positive linear correlation that is not perfect, the average o f the cress-products of Z scores is between: A) -1 and 0 B)0 and.5 C)-5 and 5 D) 0 and 1 16) The average of the cross-products of Z scores is: A) never more than +1.0 or less than-1.0 C) never more than +1.0 or less than0 B) never more than +10.0 or less than-10.0 D) never more than +10.0 or less than 0 17) When is the correlation coefficient zero? A) It is never zero B) When there is no linear correlation D) When there is a perfect negative linear correlation C) When there is a perfect positive linear correlation articular 18) You are interested in the relation between the number of years worling for a p company and loneliness at work. You survey 40 workers at this company and figure a correlation between these two variables of-90. This is considered a: A) weak positive linear correlation B) weak negative linear correlation C) strong positive linear correlation D) strong negative linear correlation 19) You conduct a study in which you measure two political attitudes and find a correlation of +.07 This is considered a: A) weak positive lincar correlation B) weak negative linear correlation C) strong positive linear correlationD) strong negative linear correlation 20) You take the sum of the cross-products of Z scores and divide it by the number of people in the study. You are figuring: A) the Pearson correlation coefficient C) Kendall's tau coefficient B) the proportionate reduction in error D) the raw scores 21) It is # good idea to make a scatter diagram before figuring the correlation coefficient. This is guring the correlation if you can see a clear line formed A) there ae different procedures depending on whether there appears to be a positive or a negative because: is no pon B) you to estimate the degree and direction of correlation to provide a check on your to ) it allows aslod o figure a correlation coeficien if you se a clear curvilincar corrlation B) resistance C) relative distanceD) regression D) you lation coefficient is abbreviated by the letter r, which stands for: A) relation ich of the following represents the strongest linear correlation? Wh B)+88 C)-92 D)-18 A) +09

Explanation / Answer

14)

C) Because of nature of z score, the cross product will be always positive,

15)

D) 0 and 1

16)

A) never more than 1.0 and less than -1.0

17)

B) when there is no linear correlation.

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