Probability and Statistics questions, type of samplings!!

Question

1. our friend conducted a study on the number of calories in bottles of sports drinks. He went to his kitchen and recorded the calories of the sports drinks in the refrigerator. What kind of sampling was conducted?
2. Clemson University and The University of South Carolina have approximately the same number of season ticket holders. 1000 individuals were randomly selected from each fan base to determine the income of season ticket holders. What type of sampling was conducted?
3. A deck of cards were shuffled five times by your friend. Then he fanned out the deck so that you could not see the face value of the cards and asked you to choose 3. What type of sampling was conducted? 
4. You wondered how many people wanted to loose weight before the summer, so you posted the question on Facebook. What kind of sampling was conducted?  
5. To collect data, a researcher tooks all of the zip codes in the US and chose 50. Then she sent questionnaires to all of addresses in those zip codes. What kind of sampling was conducted? 
6. At a concert, you wanted to find out the crowd's favorite song. You asked every 8th person in line. What kind of sampling was conducted?

choices for all are Cluster sampling, Convenience sampling, Stratified sampling, Systematic sampling, and Simple Random Sampling

 

Answer 1

Hello Mary L.,

I will go over what these types of sampling are. Then see if you can pick the answers. You may send in your answers to be checked by an Expert.

In cluster sampling, you make subgroups (such as neighborhoods) and then randomly pick one or more of the subgroups and take everyone in those subgroups.

In convenience sampling, you do what is easiest. Pick people who are most easily available and it is NOT a random sample of the general population.

Stratified sampling is random and you pick people from subgroups or categories (such as males and females or Democrats and Republicans).

In systematic sampling, you list everyone who is eligible for your study and then pick every nth person (such as every 5th person).

In simple random sampling, you list all eligible people and then select people at random. It would be like putting everyone's name on a paper, putting the papers in a bag, and then picking out some papers.