Answer:
The correct answer is:
b. We reject the null hypothesis, the mean delivery time is different at least on one of the days of the week.
Step-by-step explanation:
In statistical hypothesis testing, the null hypothesis typically assumes no significant difference or relationship between variables, while the alternative hypothesis suggests the presence of a significant difference or relationship. In this case, the null hypothesis would state that the mean delivery time is the same for all days of the week, while the alternative hypothesis would propose that there is a difference in the mean delivery time between at least one pair of days.
By rejecting the null hypothesis, we conclude that there is evidence to support the alternative hypothesis, indicating that the mean delivery time varies across different days of the week.