Steinberg quiz 7

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Regent University *

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321

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Statistics

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Feb 20, 2024

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docx

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Uploaded by ConstableGoldfish992

Question 1 In a correlational study, we seek to determine. Answer how well one variable predicts another variable. Question 2 In a correlational study, there is/are _______ group(s) of subjects, and each subject is measured on _______ variable(s). Answer: 1,2 Question 3 Any correlation coefficient includes what two features? Answer strength and direction Question 4 In a scatterplot, the data for a positive correlation will graph in what direction? Answer from the bottom left to the upper right Question 5 In a scatterplot, the data for a negative correlation will graph in what direction? Answer from the upper left to the bottom right Question 6 In a scatter diagram, if one of the points does not fall on the straight line of best fit to the data points, then r cannot be Answer +1.00 or -1.00 Question 7 In the "real world" of social data, we are least likely to find values of r that are:neg Answer very close to 1.00 Question 8

Which one of the following would most likely show a negative correlation? Answer air temperature and number of inches of snow on the ground Question 9 If linear r is +.26 and curvilinear h is +.78, we can know that Answer there is a lot of variation among the scores Question 10 What effect does an outlier have on the correlation coefficient? Answer lowers the correlation Question 11 If you eliminate outliers from your data set, the amount of correlation will? Answer GO Down Question 12 You calculate a correlation and obtain a value of - 1.32. From this you know that? Answer you have made a calculation error. Question 13 Your data are in the form of ranks. Which correlation coefficient should you compute? Answer Spearman's rho Question 14 To compute a Pearson r correlation coefficient, we must have? Answer scores on two different variables for a single set of individuals Question 15

Your correlational study has 85 subjects. How many degrees of freedom does your study have? Answer 84 Question 16 A study reports: r (95) = +.92, p < .01. How many subjects were in this study? Answer 95 Question 17 A study reports: r (95) = +92, p = .01. How confident can you be that the obtained correlation is real and not due to mere chance? Answer There is not enough information to tell. Question 18 When correlation is used for prediction purposes, a value of .50 is generally considered to be? Answer C Question 19 If you recomputed the correlation on a sample twice as large as your original sample, what would happen to the tabled value of the correlation coefficient necessary for the obtained correlation to be considered "real?" Answer It would decrease. Question 20 If you square the correlation coefficient, you get? Answer the sample size needed for statistical significance. Question 21 The correlation between two variables is - .64. How much common variance is there between these two variables? Answer

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+.41 Question 22 Under which one of the following conditions may a causal relationship between variables X and Y be inferred? Answer Whenever the correlation coefficient is positive. Question 23 If two variables are correlated .90, it means that they share 90% of their variance in common. Answer False Question 24 The larger the sample size, the larger the calculated r must be to be statistically significant. Answer True Question 25 The more homogeneous the subjects, the more similar their scores tend to be. Answer true