Homework 4.2.pdf - Math 1342 Homework 4.2 Linear...

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Math 1342 - Homework 4.2: Linear Correlation and Regression 1.) A study is conducted to find out 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 work processing program. Data is below: Typing speed, x 48 74 52 79 83 56 85 63 88 Time to learn new pgm, y 7 4 8 3.5 2 6 2.3 5 2.1 a.) Which statement is true concerning this data? Circle your answer. There is no linear correlation. There is a significant positive linear correlation. There is a significant negative linear correlation. b.) Give the equation of the regression line _______________________________________(coefficients to 4 dec) c.) Predict the time it takes a secretary to learn the new word processing program if her typing speed is 80 words per minute. ________ Round to nearest whole number. d.) Find the residual for 1 st secretary. __________________ e.) Find the residual for last secretary. _____________ f.) What is the explanatory variable in this data? _________________________ 2.) A study was conducted with vegetarians to see whether the number of grams of protein each ate per day was related to diastolic blood pressure.
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