A health psychologist was interested in the effects of vitamin supplements on the immune system. Three groups of adults were exposed (in a highly ethical way) to the cold virus; one group took no supplements for a week before exposure, another had vitamin C supplements, and a third had multivitamins (excluding C). The severity of the cold was measured as a percentage (0% = not contracted, 100% = very severe symptoms). The psychologist also measured the number of cigarettes that each person smoked per day, as smoking suppresses the immune system. The psychologist was interested in the differences in the severity of the illnesses across different vitamin groups accounting for cigarette usage. What technique should be used to analyse these data?

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A health psychologist was interested in the effects of vitamin supplements on the
immune system. Three groups of adults were exposed (in a highly ethical way) to the
cold virus; one group took no supplements for a week before exposure, another had
vitamin C supplements, and a third had multivitamins (excluding C). The severity of
the cold was measured as a percentage (0% = not contracted, 100% = very severe
symptoms). The psychologist also measured the number of cigarettes that each
person smoked per day, as smoking suppresses the immune system. The
psychologist was interested in the differėnces in the severity of the illnesses across
different vitamin groups accounting for cigarette usage. What technique should be
used to analyse these data?
Transcribed Image Text:A health psychologist was interested in the effects of vitamin supplements on the immune system. Three groups of adults were exposed (in a highly ethical way) to the cold virus; one group took no supplements for a week before exposure, another had vitamin C supplements, and a third had multivitamins (excluding C). The severity of the cold was measured as a percentage (0% = not contracted, 100% = very severe symptoms). The psychologist also measured the number of cigarettes that each person smoked per day, as smoking suppresses the immune system. The psychologist was interested in the differėnces in the severity of the illnesses across different vitamin groups accounting for cigarette usage. What technique should be used to analyse these data?
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