Author Question: The interesting thing about confidence intervals established employing stratified sampling is that ... (Read 92 times)

Caiter2013 · **on:** Jun 28, 2018

The interesting thing about confidence intervals established employing stratified sampling is that
a. the within-strata variability does not enter into the calculation of the standard error of estimate.
b. the between-strata variability does not enter into the calculation of the standard error of estimate.
c. neither the within-strata variability nor the between-strata variability enters into the calculation of the standard error of estimate.
d. the confidence interval is wider than that established employing simple random sampling.
e. the sample mean provides a biased estimate of the population mean.

Question 2

Small businesses find SMM:
a. too difficult and complex to use.
b. helps generate exposure and sales.
c. ineffective in increasing sales.
d. only works if they focus on it to the exclusion of any other advertising.