A nutritionist in the FDA wants to compare the caloric content of medium French fries sold by Wendonald (Population 1) and McKing (Population 2) fast-food chains, to see if there is any difference between them. To test this, random samples from each chain is taken and the caloric contents of French fries are measured. The finding is summarized in the table on next page. Conduct an independent-samples t test to test whether there is any difference between the caloric content of French fries sold by the two chains, following the steps below.                                   Wendonald McKing = 32  = 30  = 390 calories  = 365 calories  = 30 calories  = 38 calories Suppose your calculated t statistic is 2.90 (Note this is a hypothetical situation, not the actual result from your test), what decision do you make with respect to the statistical hypotheses for this study? State your interpretation with reference to the question asked.   Decision:   Interpretation:

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.