In August 2022, Gallup conducted a survey of US adults, and asked them

about their grocery shopping habits. Copy the following URL into your browser, and

take a quick look at the results:

https://news.gallup.com/poll/397706/person-grocery-shopping-rebounds-online.aspx

In particular, click on the box labelled "Survey Methods" at the bottom of the article,

to read more about how the data was collected.

a. What was the population of interest for this survey? What was the size of the

sample?

b. Based on the second plot in the article, what percentage of US adults in the

sample stated that they ordered groceries online for pickup or delivery at least

monthly, in 2021? What about in 2022?

c. Was this a simple random sample (SRS)? Explain why or why not, in terms of

how the sample was obtained. In your answer, refer to the two rules for SRSs,

and explain why each one does or does not hold. (A detailed description of the

sampling methodology can be found in the "Survey Methods" section at the

bottom.)