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QUESTION 3 A local university claimed that there is signicant difference in the average starting salary offer per month between those who hold a bachelor's degree in mechanical engineering and electrical engineering. The starting salary for recent graduates with mechanical engineering and electrical engineering degree from the local university were recorded and analyzed by using SPSS. The following output indicated the results of the analysis. Group Statistics Std. Deviation Std. Error Mean Starting salary Mechanical Engineering T 3314.29 134.519 50.843 (RM) Electrical Engineering ? 2323.5? 269.03? 101.686 Independent Samples Test Levene's Test for Equality of Variances ttest for Equality of Means I 95% Condence Sig. Mean Std. Error Interval of the {2 Difference Difference Difference tailed) Lower Upper 113.689 238.007 733.421 F Sig. t d1 Equal variances 2.451 0.143 4.272 12 Starting assumed salary (RM) 485-714 Equal van'ances not assumed 8.824 0.002 485-714 113.689 22?.746 743.683 Assume that the data are normally distributed. a) Based on p-value in the Levene's test, what can be concluded about the equality of variances? Use c = 0.05. (3 marks) b) Using conclusion in a), calculate 98% confidence interval for the difference of average starting salary offer per month between both engineering graduates. Justify your