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[Solved] A stratified random sample taken from a finite population of 180 payments produced the tabular summary shown below. Stratum Stratum size Sample

Question: A stratified random sample taken from a finite population of 180 payments produced the tabular summary shown below.

Stratum Stratum size Sample size Sample mean Sample std. dev.
1 100 30 50 20
2 50 20 150 80
3 30 10 300 150
  1. Calculate the stratified-random-sampling estimate of the population mean .
  2. Calculate the (estimated) standard error of the estimate given in (a).
  3. Give an approximate 90% confidence interval for the population total.

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Solution: The downloadable solution consists of 2 pages
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