Suppose you were to read about a study showing that people who sleep less than five hours a night ...

Suppose you were to read about a study showing that people who sleep less than five hours a night have twice as much risk of a premature death as people who sleep seven or eight hours a night.Can you conclude that sleeping the shorter hours causes a higher risk of premature death?
 a. No, because the result was clearly based on an observational study.
  b. Yes, because the result was clearly based on a randomized experiment.
  c. The answer depends on whether the research was based on an observational study or a randomized experiment, and it isn't obvious which was used.
  d. No, because the baseline risk of premature death is not given.

Q. 2

At Central Michigan University, 500 students are randomly selected and asked the distance of their commute to campus. From this group a mean of 15.6 miles is computed. What is the sample?

Q. 3

At Central Michigan University, 500 students are randomly selected and asked the distance of their commute to campus. From this group a mean of 15.6 miles is computed. What is the parameter?

Q. 4

At Central Michigan University, 500 students are randomly selected and asked the distance of their commute to campus. From this group a mean of 15.6 miles is computed. What is the variable of interest?

Q. 5

At Central Michigan University, 500 students are randomly selected and asked the distance of their commute to campus. From this group a mean of 15.6 miles is computed. What is the statistic?

Q. 6

A study by health economists at a southern university indicated that Parkinson's disease cost the nation 85 billion a year in medical expenses and lost productivity. Patients' earning loss was 25 billion, the value of time of unpaid caregivers was 35 billion, and the cost of paid care was 22 billion. What is the statistic?

Q. 7

A study by health economists at a southern university indicated that Parkinson's disease cost the nation 85 billion a year in medical expenses and lost productivity. Patients' earning loss was 25 billion, the value of time of unpaid caregivers was 35 billion, and the cost of paid care was 22 billion. What is the parameter?