A large company has developed a written test to screen applicants, and the mark on this test has been a good predictor of employee suitability for the graduates that are hired. Because administering the test is time-consuming and costly, the company is wondering if it is worthwhile. One cheaper option is to rely on the overall average mark of the graduate as an indicator of suitability. An analyst has collected data on the overall average mark of a number of interviewees, and their scores (out of 70) on the company test. Create a scatter diagram for the data. Does it appear that there is a relationship between the two variables? Describe it, generally and mathematically.
Answer to relevant QuestionsCheck the requirements for regression for the data set of overall average marks and company test scores from Exercise 20. In exercise A large company has developed a written test to screen applicants, and the mark on this ...Why should you think carefully about any obvious outlier in the sample data set for a regression relationship, rather than simply removing it? Apply the formula for the adjusted R2 to verify the value shown in Exhibit 14.17. Note that the SSE and SST are shown in the Excel Regression output. Use the salaries model based on years of postsecondary education and age to make a 95% confidence interval estimate of the average salary for individuals who are 35 years old and have five years of postsecondary education. ...Build a regression model, with indicator variables for battery brand, to assess whether there is a significant relationship between battery life in minutes and battery brand. This revisits the battery example in Chapter 11.
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