Answer:
We can find the critical value 
And for this case if the confidence increase the critical value increase so then this statement is True
Step-by-step explanation:
For a confidence level given c, we can find the significance level like this:

And with the degrees of freedom given by:
We can find the critical value 
And for this case if the confidence increase the critical value increase so then this statement is True
Answer:
A
Step-by-step explanation:
16 × 2 = 32
20 × 2 = 40
hshsjbdjidjeje
I am not sure but it is right if your question is right.
Answer:
The answer is option B.
Step-by-step explanation:

Hope this helps you
The answer is (1,4) and (-1,-4)