Question 6 A researcher identified a correlation of -.98 between two variables. How should we probably interpret this finding? The correlation is a very useful finding. The correlation is useless. The correlation is probably one that most people would never have known about. The two variables are probably just two indicators of the same variable. Question 7 Which of the following correlation coefficients expresses the strongest association? .10 0 -.50 -1.00 Question 8 A correlation coefficient can be computed using many different statistical formulas. The mot commonly used one results in a ____________________. Spearman's Rho Pearson's product moment correlation coefficient Multiple r coefficient of determination Question 9 Correlation means causation. True False Question 10 The difference in positive and negative correlations is: _____________. A positive correlation means an effective treatment, a negative correlations means an ineffective treatment. A positive correlation is the result of both variables increasing and a negative correlation is when one increases and the other decreases. A positive correlation is the result of both variables increasing or decreasing and a negative correlations is when one increases and the other decreases. A positive correlation is all that matters.
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98, which indicates a very strong negative correlation between the two variables. Show more…
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15. Your Spearman correlation coefficient is -0.88. What does this tell you? A. There is a strong, positive relationship between the variables. As variable X increases, variable Y increases. B. There is a strong, negative relationship between the variables. As variable X increases, variable Y decreases. C. There is a weak, negative relationship between the variables. As variable X decreases, variable Y decreases. D. There is a weak, negative relationship between the variables. As variable X increases, variable Y decreases. E. There must have been an error in the calculation. A negative number is not permitted and therefore cannot be interpreted. 16. Which of the following is the FIRST step in deciding between using the Spearman and the Pearson correlation coefficient: A. check the significance level [1% vs 5%] B. determine the type of test: one-tailed vs two-tailed C. count the number of observations in the data sets D. identify the level of measurement of the data being tested E. determine whether you want to find causation or use the correlation coefficient to predict future outcomes based on available data
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Refer to the accompanying scatterplot. a. Examine the pattern of all 10 points and subjectively determine whether there appears to be a strong correlation between x and y. b. Find the value of the correlation coefficient r and determine whether there is a linear correlation. c. Remove the point with coordinates (9,1) and find the correlation coefficient r and determine whether there is a linear correlation. d. What do you conclude about the possible effect from a single pair of values? Click here to view a table of critical values for the correlation coefficient. a. Do the data points appear to have a strong linear correlation? Yes No b. What is the value of the correlation coefficient for all 10 data points? r = (Simplify your answer. Round to three decimal places as needed.) Enter your answer in the answer box and then click Check Answer.
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