The average number of times a person presses the snooze button in the morning is 4 times. A pharmaceutical company believes this is not correct. What is the alternative hypothesis? a) $\mu=4$ b) $\mu \neq 4$ c) $\mu>4$ d) $\mu<4$

Step 1 ：The question is asking for the alternative hypothesis. In hypothesis testing, the alternative hypothesis is what you might believe to be true or hope to prove true.

Step 2 ：The pharmaceutical company believes that the average number of times a person presses the snooze button in the morning is not 4 times.

Step 3 ：Therefore, the alternative hypothesis should be that the mean is not equal to 4.

Step 4 ：Final Answer: The alternative hypothesis is \( \boxed{\mu \neq 4} \)