Question

a soup company wants to know if a new formula would sell better than the old one. out of a focus group of 20 randomly selected volunteers, 10 get the new formula and 10 get the old one. the company then has each group rate the soup. which is the control group? everyone who buys soup. the 20 in the focus group. the 10 that get the old formula. the 10 that get the new formula.

Explanation:

In an experiment, the control group is the one that does not receive the treatment (in this case, the new formula). The 10 who get the old one are used as a baseline to compare against the group that gets the new formula. The 20 in the focus group are part of the experimental setup (either getting new or old, but the key is identifying the control - which is the group with the old formula as they aren't getting the new "treatment").

Answer:

The 10 that get the old formula