Micro Brewery is interested in whether there is a difference in the proportion of people of different age groups who prefer low-carbohydrate beer. The table below contains the survey results.

a. Determine at a 5% level of statistical significance whether there is a difference in the proportion of people of different ages who prefer low-carbohydrate beer.

b. If appropriate, use the Marascuilo procedure and α = 0.05 to determine which age groups are different.