Tutorial 7: Correlation and Regression Do a complete regression analysis by performing the following steps: a. Draw the scatter plot. b. Compute the value of the correlation coefficient. c. Determine the regression line equation if r is significant. d. Plot the regression line on the scatter plot, if appropriate. e. Predict y' for a specific value of x, if appropriate. 1. At a large department store customers were asked to rate the service and the materials purchased on a scale from 1 to 10, with 10 being the highest rating. Then the amount that they spent was recorded. Is there evidence of a relationship between the rating and the amount that they spent? Rating, x 6 8 2 9 5 Amount spent, y $90 $83 $42 $110 $27 $31 2. A researcher desires to know whether the typing speed of a secretary (in words per minute) is related to the time (in hours) that it takes the secretary to learn to use a new word processing program. The data are shown. Speed, x 48 74 52 79 83 56 63 88 74 90 92 Time, y 7 4 3 3.5 2 6 2.3 5 2.1 4.5 1.9 1.5 If there is a significant relationship, predict the time it will take the average secretary who has a typing speed of 72 words per minute to learn the word processing program. O

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