Question: 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

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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