Question

a random sample of size 200 is drawn from a large population. The population standard deviation is 1.2. The sample mean is 15.8. Estimate the size of the population mean including margin of error.

Answer 1

Step-by-step Answer:

N=sample size = 200

sigma = population standard deviation = 1.2

s=Sample mean = 15.8

Best estimate of population mean = 15.8

standard error = sigma / sqrt(N)

= 1.2/sqrt(200)

= 0.08485

Therefore

estimate of population mean = 15.8 +/- 0.0848