Exercise 6. Regression Fallacy. Historically, scores on the two midterms had a correlation of 0.48. Suppose that Jeri scored 2.1 standard deviations below the mean on the first midterm. (a) How many standard deviations [above or below?] the mean would you predict for her second midterm?

You would expect ______ between the number of hours of sleep per day and age for children between the ages of 1 and 5. a. A positive correlation b. No correlation c. A nonlinear correlation d. A negative correlation

Which correlation coefficient does not belong with the other three? Or = 0.98 Or = 0.96 Or = - 0.1 Or = - 0.96

If the value of the Pearson correlation is r=+1.00 or -1.00, then all data points in a scatter plot fit perfectly on a straight line.

use the sample data to construct a scatterplot. Use the first variable for the x-axis. Based on the scatterplot, what do you conclude about a linear correlation? FORECAST AND ACTUAL TEMPERATURES The table lists actual high temperatures and the high temperatures that were previously forecasted for these same days. The table includes data for ten different days near the author’s home. What does the result suggest about the accuracy of five-day predicted high temperatures?

Which plot indicates a correlation of 0.7? A R 8 8 in 10 A

For a set of correlated data, you calculate that the correlation coefficient (r) is -0.87. What percent of the variation in the dependent variable is explained by variation in the independent variable?  D2L requires decimal format. Convert your percentage to a decimal rounded to the third place. i.e. 51.2218% = 0.512.

Closing price of two stocks are recorded for 50 days. The sample standard deviation of stock X is 7.240 and the sample standard deviation of stock Y is 9.833. The sample covariance is -$22.075. What is the correlation coefficient?

If SST = 864, SSE = 494, SSxy = -20, and SSxx = 1.08 what is the value of the coefficient of correlation? 0.756 0.428 -0.654 -0.572

An r value of .8 indicates a strong positive correlation.  True  False