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가.tt! Sr.ptı.T1-51 .)。. Leight 2. and whether adding Researchers investigated the possible beneficial eff milk to the tea reduces any possible benefit. Twenty-four volunteers were randomly assigned to one of three groups. Every day for a month, participants in group 1 drank two cups of hot black tea without milk, participants in group 2 drank two cups of hot black tea with milk, and participants in group 3 drank two cups of hot water but no tea. At the end of the month, the researchers measured the change in each of the participants heart health. (a) Did the researchers conduct an experiment or an observational study? Explain. An experi hrt hewe tte particip i tjene rwhkly alright te 、、 C h (b) Why did the researchers include a group who drank hot water but no tea? (c) Is it reasonable to generalize the results of the study beyond the 24 participants? Explain why or why not.Please check if my work is right. If it isn't please fix it or add to it. Or you can just ignore my answers and give your answers. Thank you.

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Answer 24 volunteers are randonly selected to one of the three groups. Date:22/01/2019 Group I drinks two cups of hot black tea without milk Group II drinks two cups of hot black tea with milk Group IIl drinks two cups of hot water but no tea. At the end of the month, the researchers measured the change in each of the participants heart health. The average change of health status of three Groups can be measured and let it beX X2 and X3. We carn set up the hypothesis of no difference of heart health ie Ho : μ1-μ2-μ3 against the alternative hypothesis that they are not equal. As the sample size is less than 30, we can use t-statistic. Under the above logic, (a) it is an experiment. (b) Group Ill has been tested to compare the effect of tea or to have comparison between Groupl and Group III. (c) Yes it can be generated by using the normal distriution for more than 30 sample using the Central Limit ht.

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