A 25-year old study of randomly selected 6000 adults from the United Kingdom noted four bad habits: 1)Smoking, 2) Drinking, 3) Lack of Exercise and 4) Poor Diet. The study looked to show that there is a higher death rate (proportion who die in the 25-year period) among people with all four bad habits than amongst people with none of the bad habits. a) Was this an experiment or observational study. Explain. b) State the Null and Alternative hypotheses. c) What would be the result of a TYPE I ERROR. d) What would be the result of a TYPE II ERROR. Out of the 6000 people, 314 had all four bad habits and 91 died during the study. While 387 people had none of the bad habits, 32 died during the course of the study. Does this provide sufficient evidence that there are different mortality rate between the two groups? e) Calculate and interpret the test statistic and p-value in context of this study. Be sure to check all necessary conditions and name your test.
A 25-year old study of randomly selected 6000 adults from the United Kingdom noted four bad habits: 1)Smoking, 2) Drinking, 3) Lack of Exercise and 4) Poor Diet. The study looked to show that there is a higher death rate (proportion who die in the 25-year period) among people with all four bad habits than amongst people with none of the bad habits.
a) Was this an experiment or observational study. Explain.
b) State the Null and Alternative hypotheses.
c) What would be the result of a TYPE I ERROR.
d) What would be the result of a TYPE II ERROR.
Out of the 6000 people, 314 had all four bad habits and 91 died during the study. While 387 people had none of the bad habits, 32 died during the course of the study. Does this provide sufficient evidence that there are different mortality rate between the two groups?
e) Calculate and interpret the test statistic and p-value in context of this study. Be sure to check all necessary conditions and name your test.
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