/wetwork2/Math214 Cao, Spring2018/Hw1/10/theme-BeffectiveUser xzpw@digplayMode M
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/wetwork2/Math214 Cao, Spring2018/Hw1/10/theme-BeffectiveUser xzpw@digplayMode MyUP. D WeeWorK: Math15 MATH 115 Citation Machine: AP Purdue OWL ADA FoUP Lbraries UP Pre Up Next (1 pt) A group of college students believes that herbal tea has remarkable restorative powers. To test their theory, they make weekly vists to a local nursing home, visiting with residents, talking with them, and serving them herbal lea. After several months, many of the residents are more cheerful and healthy (a) The explanatory variable in this experiment is o A. the emotional state of the residents o B. visits of the college students C.the fact that this is a local nursing home. o D. herbal tea (b) Which of the following may be correcty concluded trom this study? A. riesbai iea Goes upoe one's emotional state, at least for the resk o B. The results of the study are not convincing because only a local nursing home was used and only for a few o C. There is some evidence that herbal tea may improve one's emotional state. The results would be completely convincing if a scientist had conducted the study rather than a group of college students D. The results of the study are not convincing because the effect of herbal tea is contounded with several other factors (C) The lurking variable in this experiment is A. the fact that this is a local nursing home B. visits of the colege students C. the emotional state of the residents D. herbal teaExplanation / Answer
a)
herbal tea
b)
option d) is correct
The effect of the herbal tea is confounded with the effect of increased social interaction. It may well be that it was just having visitors that caused the the residents to be more cheerful and healthy. A control group of residents that received visits but no tea is needed before any claims for herbal tea can be made.
c)
visits of the college students
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