# Critical Values

8 Questions

QUESTION 1 of 8

80% confidence level = 1.282 Stat 2

that is the answer that the book gave. Where did the extra 2 come from because the answer i got is 1.28

QUESTION 2 of 8

Hello Professor, can you explain how to find the answers for question 2 in the homework 13.1?

QUESTION 3 of 8

Hi professor, I have a small question on the now you try it 7.2 problem 1
the confidence level is .99 so when I look for Z I would divide .01/2 and get .005 and look that up in the T-Table but in this particular problem we do not we simply look up .01 on the the t-table why is that?

QUESTION 4 of 8

Hi again I also need help with number 41 section 8.5 I dont understand how it supports the alternative hypothesis if the critical value 2.539 is less than 2.95.

QUESTION 5 of 8

Hi Professor, From #42 of the 7.4 HW, the degrees of freedom is 127 and that number is not on the t-table so I don't know how to get the answer appropriately.

QUESTION 6 of 8

For Homework 7.4 For number 42 n=128 so n-1=127 that number isnt on the t-table so how would you solve it? Also for homework 7.4 if the sample size is 30 or greater do we use the z-table?

QUESTION 7 of 8

Hi professor
I am having trouble finding the t-value on #14 of section 9.3. The df is 52, however, I don't see 52 on the t-table chart.

QUESTION 8 of 8

Hello Professor,

I am trying to do Homework Problem 40 for Section 7.4. I can't seem to figure out how to use it with Z instead of T. Can you please explain how to do this problem?

Thank you