The variable 2013 Cost represents the four-year cost including tuition, supplies, room and board. The variable Annual
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Go to www.pearsonhighered.com/ sullivanstats to obtain the data file 4_2_28 using the file format of your choice for the version of the text you are using.
(a) In Problem 47 from Section 4.1, we saw that a scatter diagram between 2013 Cost and Grad Rate treating 2013 Cost as the explanatory variable suggested a positive association between the two variables. Find the least-squares regression line treating 2013 Cost as the explanatory variable. Round the slope to six decimal places.
(b) Interpret the slope.
(c) Washington University in St. Louis has a four-year cost of $234,600 and a graduation rate of 94%. Is Washington University's graduation rate above or below average among schools that cost $234,600?
(d) A scatter diagram between cost and return on investment (treating cost as the explanatory variable) suggested a negative association between the two variables. Find the least-squares regression line treating cost as the explanatory variable. Round the slope to seven decimal places.
(e) Interpret the slope.
(f) Washington University's return on investment is 6.1%. Is this above or below average among all schools that cost $234,600?
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Related Book For
Statistics Informed Decisions Using Data
ISBN: 9780134133539
5th Edition
Authors: Michael Sullivan III
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