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1. Assuming you are analyst: below is explaining what concerns you may have regarding sampling based on 24/7 nature of a hospital environment and the various departments with a hospital. How would you design your sampling plan to account for this situation?
Answer:
a) Do studies on all shifts (probably four shifts). Three shifts each day plus the weekend shift to get data to workload differences by shift. b) Then cross-check with another studies by function area (emergency room, x-ray and lab facilities, a maternity ward, an intensive care unit, and outpatient surgery unit). c) If identifiable differences are present. d) Then judgments will need to be made about additional studies. e) It may be major differences exists, suggesting that more extensive studied be made. f) Generate a random sample of which nurse to sample when using a random device such as the random number table provide in the txt in appendix III. g) Perform an adequate number of samples (see question 2). 2. How large must the sample be given to Benton’s assumptions of the mix of nurse to housekeeping duty.
Sample size n=Z2xP1-ph2 n = required sample size
Z =1.96 for 95% confidence level (Table S10.1, p346)
P= estimate of idle proportion 15% =0.15 h =acceptable error of 4% =0.04 n=1.962x0.15x0.850.042 n=3.84x0.12750.0016=0.490.0016=306.13
Answer: The sample size must be given to Benton = 306 of mix of nurse to housekeeping duty. 3.1 What if Benton revives his estimate and believes housekeeping really take op 25% of a nurse’s time? What the sample size then?
Sample size n=Z2xP1-ph2 n = required sample size
Z =1.96 for 95% confidence level (Table S10.1, p346)
P= estimate of idle proportion 25% =0.25 h=acceptable error of 4% =0.04 n=1.962x0.25x0.750.042 n=3.84x0.18750.0016 =0.720.0016=450
Answer: The sample size = 450 if Benton revises his estimate

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