Answer:
22
Step-by-step explanation:
Answer:
t ∈ ℝ
Step-by-step explanation:
Answer:
The decision made by the researcher based on this information is to reject the null hypothesis.
Step-by-step explanation:
Two-tailed hypothesis test:
Critical value: 
Test statistic: z
If
, we do not reject the null hypothesis.
If
, we reject the null hypothesis.
In this question:

Since
, we reject the null hypothesis.
The decision made by the researcher based on this information is to reject the null hypothesis.
Answer:
C.
Step-by-step explanation:
As we can see on the graph C is our answer.