Social Studies, 06.12.2021 07:50 61497

The general manager of an engineering company wants to know if a technical artist's experience affects the quality of their work. A random sample of 24 artists is selected and their multi-year work experience and quality rating recorded (reviewed by their supervisor). Years of work experience (EXPER) and quality ratings (RATING) take a value from 1 to 7, with 7 = excellent and 1 = poor. A simple regression model RATING = B, + BEXPER + e is proposed. The squared estimate of the model and the standard error of the estimate are %3D RATING = 3.204 + 0.076 EXPER (a) Outline the estimated regression function. Explain the coefficients of EXPER. (b) Construct a 95% confidence interval for B2, the slope of the relationship between quality ratings and experience. Confident? Test the null hypothesis that B2 is 0 compared to the solution without using two-tailed test and significance level 0.05. What to do (d) Test the null hypothesis that B2 is zero against the one-tailed option that it is positive at significance level a = 0.05. What do you conclude? (e) For the test in (c), the p-value is 0.0982. If we take the probability of a type I error to be a = 0.05. do we reject null hy pothe sis, just based on testing p value? Shows, in a graph, the calculated pkvalue. you conclude?

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