1- Simple Random Sample which of the following is/are simple random samples?

A- As Lipitor pills are being manufactured, a quality control plan is to select every 500th pill and test it to confirm that it contains 80 mg of atorvastatin.

B-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.

C-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.

2-College in United States Currently, there are 4612 colleges in the United States and the number of full-time students is 13,203,477.

A- Are the numbers of full students at different colleges discrete or continuous?

B- What is the level of measurement for the number of full-time students at college?(nominal,ordinal,interval,ratio)

C-What is wrong with surveying college students by mailing questionnaires to 10,000 of them who are randomly selected?

D-If we randomly select 50 full-time college students in each of the 50 states, what are type of the sample is obtained?(random, systematic, convenience, stratified,cluster)

E-If we randomly select four colleges and survey all of their full-time students,what type of sample is obtained?(random,systematic,convenience,stratifield,cluster).

3- Statistical significance and Pratical Significance The Technogene Research Group has developed a procedure designed to increase the likelihood that baby will be born a girl.In a clinical trial of their procedure, 236 girls were born to 450 differents couples. If the method has no effect, there is about a 15% chance that such extreme results would occur.Does the procedure appear to have statistical significance ? Does the procedure appear to have practical significance?