=+41. Supplement test. A pharmaceutical company is producing and marketing a vitamin supplement to help fight infections.

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=+41. Supplement test. A pharmaceutical company is producing and marketing a vitamin supplement to help fight infections. In an experiment to test the product, subjects were assigned randomly to take the vitamin supplement or a placebo. The number of days of illness from infections was recorded. Here are boxplots comparing the two groups and some computer output from a two-sample t-test computed for the data.

0 20 40 Supplement Placebo 2-Sample t-Test of ms - mp … 0 Difference Between Means = -2.83 t-Statistic = -2.40 w/94 df P = 0.0091

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