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QUESTION 4 The following results represent the running times of films produced by two motion picture companies. Assume the distribution of the running time is approximately normally distributed. Independent Samples Test Running Time Equal Equal variances variances not assumed assumed Levene's Test for Equality F .030 of Variances Sig. .864 t-test for Equality of df 35 33.033 Means Mean Difference -30.49405 -30.49405 Std. Error Difference 5.65960 5.63060 a) Can it be concluded the variances are equal? Test at a=0.1. (4 marks) b) Compute the t-statistic for this study. (2 marks) c) At the 10% level of significance, is there any evidence to indicate the average running time for Company X shorter than the Company Y. (4 marks)