Currently, there are 4227 Wal-Mart stores in the United States and another 3210 stores outside of the United States.
a. Are the numbers of Wal-Mart stores discrete or continuous?
b. What is the level of measurement for the numbers of Wal-Mart stores in different years? (Nominal, ordinal, interval, ratio)
c. If a survey is conducted by randomly selecting 10 customers in every Wal-Mart store, what type of sampling is used? (Random, systematic, convenience, stratified, cluster)
d. If a survey is conducted by randomly selecting 20 Wal-Mart stores and interviewing all of the employees at the selected stores, what type of sampling is used? (Random, systematic, convenience, stratified, cluster)
e. What is wrong with surveying customer satisfaction by mailing questionnaires to 10,000 randomly selected customers?