Questions 11-20 are based on the data in Table 2. This shows the cost in US$ 000’s per month of a random sample of public clinics in a city.
Table 2: Clinic Monthly Operating Costs in US$000’S
11. The biased point estimator of the average cost per month of all North clinics is:
a) Sample mean
b) Sample median
c) Trimmed mean
d) None of these
12. The unbiased point estimate of the average cost per month (in US$ 000's) of all South clinics
is:
a) 89.0
b) 91.5
c) 91.6
d) 91.7
13. The standard error of the mean monthly cost of a North clinic is:
a) 0.39
b) 51.84
c) 2.72
d) 7.41
14. The point estimate for the standard deviation of the cost for all of the clinics in the Central
district (US$000's) is:
a) 2.03
b) 8.56
c) 12.2
d) 73.2
15. Assuming normality, the 94% confidence interval for the average monthly cost of all Central
clinics (in US$000’s) is:
a) 58.8 to 87.0
b) 52.8 to 92.1
c) 70.2 to 75.6
d) 60.7 to 85.1
District Clinics Mean Median Tri. Mean Variance S. E. Mean
North 49 73.8 75 73.5 362.9 *
Central 36 72.9 74.5 72.9 73.2 1.43
South 25 91.7 89 91.5 557.4 4.72