How to know whether the variance known or unknown And if it's unknown like this example how to know whether it'sequal or un-equal variance.
*I don't want the solutions for the example, I just want to how canI know the suitable formula to solve.
How To Know Whether The Variance Known Or Unknown And If It S Unknown Like This Example How To Know Whether It S Equal 1 (82.36 KiB) Viewed 31 times
Two catalysts are being analyzed to determine how they affect the mean yield of a chemical process. Specifically, catalyst 1 is currently in use, but catalyst 2 is acceptable. Since catalyst 2 is cheaper, it should be adopted, providing it does not change the process yield. A test is run in the pilot plant and results in the data shown in Table 1 (next page). Is there any difference between the mean yields? Conduct the t-test with α=0.05, and assume equal variances.
Table 1
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