You are to conduct a sample survey to determine the mean family income in a rural area of central Florida. The question is, how many families should be sampled? In a pilot sample of 10 families, the standard deviation of the sample was $500. The sponsor of the survey wants you to use the 95 percent confidence level. The estimate is to be within $100. How many families should be interviewed?© BrainMass Inc. brainmass.com March 4, 2021, 6:24 pm ad1c9bdddf
CI level = 95%
Since the half range of the CI = z*SE
and z(0.975) ...
The mean family income in a rural area of central Florida is determined. Statistics in a survey is examined.