A sample of 25 blue-collar employees at a production plant was taken. Each employee was asked to assess his or her own job satisfaction (x) on a scale of 1 to 10. In addition, the numbers of days absent (y) from work during the last year were found for these employees. The sample regression ,y`i = 11.6 – 1.2x,Line was estimated by least squares for these data. Also found were,a. Test, at the 1% significance level against the appropriate one-sided alternative, the null hypothesis that job satisfaction has no linear effect on absenteeism.,b. A particular employee has job satisfaction level 4. Find a 90% interval for the number of days this employee would be absent from work in a year.

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