Question

1. Simple Random Sample: Which of the following is/are simple random samples?
   1. As Lipitor pills are being manufactured, a quality control plan is selected every 500^th pill and tested to confirm that it contains 80mg of atorvastatin.

Answer: ________________

2. To test for a gender difference in the way that men and women make online purchases, Gallup surveys 500 randomly selected men and 500 randomly selected women.

Answer: ________________

3. A list of all 10,877 adults in Trinity County, California, is obtained; the list is numbered from 1 to 10,877; and then a computer is used to randomly generate 250 different numbers between 1 and 10,877. The sample consists of the adults corresponding to the selected numbers.

Answer: ________________

Answer 1

Answer:

In basic irregular example all the example of same size are similarly liable to choose.

a)

Since every one of 500th pill is chosen so it is case of efficient examining. It isn't basic arbitrary examining. Thus, test isn't basic irregular sample.

b)

Here all examples of size 500 either for men or ladies not similarly likely so test isn't basic arbitrary sample.

c)

Here all example of size 250 are similarly liable to choose so it is a case of basic arbitrary sample.