Is there a relationship between a college student’s GPA and the number of hours that student  works per week? The following data is based on a random sample. The random variable x  represents number of hours worked per week and y represents GPA. ? 15 7 30 20 60 ? 3.2 3.4 3.0 3.3 2.1 a. Plot a scatter diagram of the above data. b. Estimate the sample correlation coefficient r as positive, zero, or negative. c. Interpret your results from parts a. and b

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