Answer:
the answer is A
Step-by-step explanation:
i said a because
5×5=25
6×5=30
8×5=40
Answer:
The t distribution is used, because we have the standard deviation for the sample.
Step-by-step explanation:
When to use the z or the t distribution?
When we have the standard deviation for the population, we use the z distribution.
When we have the standard deviation for the sample, we use the t distribution.
In this question:
We have the standard deviation for the sample, which means that the t distribution is used.
I think the correct answer is B.