For statistics:a group of college a group of college students believes that herbal tea has restorative powers they test their Theory by making visits weekly to a nursing home they serve the residents tea after several months it's determined that the residents are more cheerful and healthy which of the following could be concluded from that study a there is some evidence that the herbal tea May improve ones emotional state the results could be completely convincing if a scientist had concluded the study rather than a group of college students be herbal tea does improve ones emotional state at least the residents of nursing homes see the results of the study are not convincing because only a local nursing home was used and only for a few months or D the results of the study are not convincing because the effects of herbal tea is confounded with several other factors ​