In MiniCase 10.2, we found that the mean methane gas emissions for the two pneumatic controller manufacturers were not equal. When choosing formula 10.3 to calculate the t statistic, we assumed that their variances were not equal. Was this a valid assumption? Use Cemco’s sample s1 = 147.2 scfd (n1 = 18) and Invalco’s sample s 2 5 237.9 scfd (n2 = 17) to find out.,(a) State the hypotheses for a two-tailed test.,(b) Calculate the critical value for 5 .10.,(c) Calculate the test statistic.,(d) What is your conclusion?

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