Final answer:
To determine if the hypothesis 'There is something wrong with the electrical outlet' is correct, you should test it by seeing if another appliance, like a coffeemaker, also doesn't work when plugged into the same outlet.
Step-by-step explanation:
The missing step in proving whether the hypothesis is correct involves testing the hypothesis with an experiment. In this instance, the hypothesis is: a. There is something wrong with the electrical outlet. To test this, you would follow the experimental step: b. If something is wrong with the outlet, my coffeemaker also won't work when plugged into it. If the coffeemaker does not work when plugged into the outlet, this would support the hypothesis that the outlet is faulty. However, if the coffeemaker works, the hypothesis is incorrect, and alternative hypotheses need to be proposed, such as the original device being broken or the possibility of a blown fuse.