a. The survey method is unlikely to result in a representative sample
b. Interview people on all days of the week.
What is a Representative Sample?
A representative sample is a sub-section of a larger population and has similar characteristics of the main group population.
a. The population of the study is the entire consumers that shop at the supermarkets who shop all days of the weeks. Therefore, asking only shoppers who shopped on Monday will most likely give you a bias response as most customers may select Wednesday. The sample doesn't represent the entire population.
b. A better survey method is picking samples on all days of the week and ask them.
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