Q1 Sampling Methods Health Care Modern Managed Hospitals MMH

Q.1 Sampling Methods: Health Care Modern Managed Hospitals (MMH) is a

national for-profi t chain of hospitals. Management wants to survey patients discharged

this past year to obtain patient satisfaction profi les. They wish to use a

sample of such patients. Several sampling techniques are described below.

Categorize each technique as simple random sample, stratifi ed sample, systematic

sample, cluster sample, or convenience sample.

(a) Obtain a list of patients discharged from all MMH facilities. Divide the

patients according to length of hospital stay (2 days or less, 3–7 days, 8–14

days, more than 14 days). Draw simple random samples from each group.

(b) Obtain lists of patients discharged from all MMH facilities. Number these

patients, and then use a random-number table to obtain the sample.

and then include all the patients on the discharge lists of the selected hospitals.

(d) At the beginning of the year, instruct each MMH facility to survey every

500th patient discharged.

(e) Instruct each MMH facility to survey 10 discharged patients this week and

send in the results

Q.2

Statistical Literacy Consider a completely randomized experiment in which a

control group is given a placebo for congestion relief and a treatment group is

given a new drug for congestion relief. Describe a double-blind procedure for

this experiment and discuss some benefi ts of such a procedure.

Q.3

General: Gathering Data Which technique for gathering data (sampling,

experiment, simulation, or census) do you think was used in the following

studies?

(a) An analysis of a sample of 31,000 patients from New York hospitals suggests

that the poor and the elderly sue for malpractice at one-fi fth the rate of

wealthier patients (Journal of the American Medical Association).

(b) The effects of wind shear on airplanes during both landing and takeoff were

studied by using complex computer programs that mimic actual fl ight.

fi eld goals was conducted by the National Football League to determine

whether fi eld goals account for more scoring events than touchdowns

(USA Today).

(d) An Australian study included 588 men and women who already had some

precancerous skin lesions. Half got a skin cream containing a sunscreen with

a sun protection factor of 17; half got an inactive cream. After 7 months,

those using the sunscreen with the sun protection had fewer new precancerous

skin lesions (New England Journal of Medicine).

Q-1

a)is a stratified sample (the strata are the length of stays and then a simpe random sample is taken from each strata)

b)It is is a simple random sample

c) It is a cluster sample (the clusters are the geographic region and all observations in each randomly selected cluster are selected)

d)It is a systematic sample (every 500th is selected)

e)It is a convenience sample (no obvious randomization is put into selecting the sample)