Question

1-5, Recall from Activity 1-5 that nurse Kristen Gilbert was accused of murdering hospital patients. Hospital records showed that of 257 eight-hour shifts on which Gilbert worked, a patient died on 40 of those shifts (15.6%). But of 1384 eight-hour shifts on which Gilbert did not work, a patient died on only 34 of those shifts (2.5%). Exe a. Identify the observational units, explanatory variable, and response variable. b. Is this an observational study? Explain. c. Based on the type of study, can you legitimately conclude that Gilbert caused the higher death rate on her shifts? Supi pet i attac local d. Put yourself in the role of the defense attorney. Suggest a confounding variable that offers an alternative explanation (other than Gilbert's guilt) for the observed relationship between her shifts and a higher death rate. Also explain, as if to a jury, how this confounding variable provides an alternative explanation. For a pet and a. I b. 1 Exercise 3.21 A

Answer 1

A] Observational Units, Explanatory Variables, Response Variable

1)Total woking Hours (257*8)=2056 hours .

2) A Patient Died on 40 of this shifts (40*8=320 hours working) (15.6%) when Nurse Kristen Gilbert worked

3) A Pateient Died on 34 of this shifts (34*8=272 hours Woking) (2.5%) when Nurse Kristen Gilbert not worked.

In other words it we can say that out of total 2056 hours when Nurse Kristen Gilbert worked the a patient died in 15.60% of total hours worked & on the other hand a patient died when nurse not worked is 13.29% of total hours .

B] Yes it is observational Chart

C] Yes it is concluded Nurse Kristen Gilbert caused the higher death rate on her shifts.

D] Although the rate suggest the higher rate of death when Nurse Kristen Gilbert worked the rate of death also reduce as compare to when she is not working.