Answer:
Sample: all dresses at stores in Northfield Mall
Population: all dresses at any nearby location.
Explanation:
We know that the size of the sample is always smaller than the size of the population.
Here Clara needs to purchase a new dress for a dance, so the population will be all the dresses within her location.
She decides to shop for the dress at Northfield Mall and purchase the dress from one of the stores at that mall. This indicates the small sample, that is ideally representative of the population.
So, the best answer would be :
Sample: all dresses at stores in Northfield Mall
Population: all dresses at any nearby location.