Question: 7. Sometimes it is difficult or impossible to determine the population size before selecting a random sample. Describe how you would go about selecting a

7. Sometimes it is difficult or impossible to determine the population size before selecting a random sample. Describe how you would go about selecting a random sample of trees from a 1-square-mile area of forest.

17. In stratified sampling, what value would you use in place of 1.96 if you wanted the confidence level to be 99% rather than 95%? What is the consequence of using the higher confidence level on the necessary sample size?

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