Problem sets chapter II Rating hospital services. A source ranks hospital based on each of the following items. (The unit of observation in this study is "hospital.") Identify the measurement scale of each item as quantitative, ordinal, or categorical. (a) Percentage of patients who survive a given surgical procedure. (b) Type of hospital: general, district, specialized, or teaching. (e) Average income of patients that are admitted to the hospital. (d) Mean salary of physicians working at the hospitals. (Homework) 1- Chap II 2- We are all very concerned with the rising cost of higher education and the amount of money that many students must borrow to complete their studies. A university official wants to know how much MPH students earn from employment during the academic year and during the summer. The student population at the official's school consists of 378 MPH students who have completed at least one year of MPH study at three different campuses. A questionnaire will be sent to an SRS of 75 of these students. a) You have a list of the current email addresses and telephone numbers of all the 378 students. Describe how you would derive an SRS of n = 30 from this population. b) Use Table A starting in line 13 to identify the first 3 students in your sample. (Homework) Explanatory variable and response variable. Identify the explanatory 3- variable and response variable in each of the studies described here. (a) A study of cell phone use and primary brain cancer suggested that cell phone use was not associated with an elevated risk of brain cancer. (b) Records of more than three-quarters of a million surgical procedures conducted at 34 different hospitals were monitored for anesthetics safety. The study found a mortality rate of 3.4% for one particular anesthetic. No other major anesthetics were associated with mortality greater than 1.9% (c) In a landmark study involving more than three-quarters of a million individuals in the United States, Canada, and Finland, subjects were randomly given either the Salk polio vaccine or a saline (placebo) injection. The vaccinated group experienced a polio rate of 28 per 100,000 while the placebo group had a rate of 69 per 100,000. A third group that refused to participate had a polio rate of 46 per 100,000. Experimental or nonexperimental? Determine whether each of the studies described in Exercise 3 are experimental or nonexperimental. Explain your reasoning in each instance. 3a