Question

Helloo, I really need help with Statistics.. How can I find the error E. I will attached the work.
Please help!
Thanks,

Answer 1

@jim_thompson5910 Hi, my life saver.. I have a question. How can I find the t a/2 corresponding to 95% confidence level, where the number of degrees of freedom is given by n-1=40 and a=100%-95%=0.05.? How can plug them in to get the error?
Please help!! :))

Answer 2

so for part a) the answer of 1.7 is incorrect ?

Answer 3

No it is good, but I can I find the number.? as youcan see the computer was the one that got it right...

Answer 4

well if you're supposed to be using the t-distribution, then I think I see how to get 1.7

but, do you have any tables you want to use? or did you want to use a calculator?

Answer 5

oh and btw, it's a 99% confidence interval NOT a 95% confidence interval

Answer 6

and I'm not sure how you got n-1 = 41-1 = 40 degrees of freedom when n = 61 in this problem

Answer 7

OOhh Because it was another question

Answer 8

Sorry

Answer 9

I would like to see if I can use the calculator, but the profesor said there is no table.

Answer 10

alright, what kind of calculator do you have

Answer 11

TI-30XIIS

Answer 12

hmm idk if that calculator can do statistics (the statistics we want -- like calculate cdfs or inverse cdfs)

Answer 13

is there a statistics button or menu on it?

Answer 14

Yes

Answer 15

is there a distribution sub menu in there?

Answer 16

Sorry, not sure what is happening with this website..

Answer 17

How can I find it?

Answer 18

I'm not too familiar with TI-30XIIS, so I'm not sure

Answer 19

what do you see in the statistics menu?

Answer 20

1-var 2-var

Answer 21

ok try 1 var

Answer 22

what do you see in there

Answer 23

nothing..

Answer 24

it's literally empty?

Answer 25

the screen is clean.

Answer 26

strange

Answer 27

why would they have that option if it does nothing?

Answer 28

Yes, at the bottom on the right side it says Stat Deg

Answer 29

are you allowed to use another calculator?

Answer 30

Nooo,...I wish! the made me return the other one TI-84

Answer 31

ah, that's a shame because I know for sure that a TI-84 has the proper stats functions to answer this question

Answer 32

Ohh wao...

Answer 33

because i use it all the time (never really used a TI-30 though)

Answer 34

Should I plug it in even though the screen is empty??

Answer 35

yeah try anything you can to get it to work

Answer 36

If was your calculator how you plug them in.??

Answer 37

I would use the invnorm function to find the critical value, but that function isn't on the TI-30 it seems

Answer 38

Oohh, that is not fair... So how do I find the error... she said to find the t... But I try and try and don't get it..

Answer 39

are you sure you're not allowed to use tables?

Answer 40

because if your calculator can't handle this, then you have no choice but to use the table

Answer 41

Soo, you think there is should be a table..?? because there is nothing in the syllabus and I also asked her and she didn't confirm me that there is one>

Answer 42

well if you're supposed to use the t-distribution, then you would use the inverse t table

does your book have that at all?

Answer 43

This is what she said to me. "In problem 12 of chpt 7 HW, the population standard deviation sigma is not given. Consequently, the critical value you look for is t_alpha/2 for which you will need to use a Student t-distribution with degrees of freedom = n - 1 and the area in one or two tails obtained directly from the significance level (which is alpha.)"

Answer 44

oh do you remember those tables you sent me last time?

Answer 45

Yes!

Answer 46

can you send them to me again

Answer 47

I found something. let me find the way to send it to you and you can confirm that to me.

Answer 48

ok

Answer 49

No way of how to send it.. I found it all the way in the back of the book. and I thinks is the table.

Answer 50

ok, then tell which value you get then

Answer 51

Is not fair, my professor didn't tell us that we have tables to use. You know when those question come out. she should let us know..

Answer 52

This is also an online class...... Yes!! I found it.. it is the t Distrubution table...

Answer 53

yeah it's definitely unfair, she should have told you

Answer 54

good

Answer 55

Thanks again!! At least I talked to you.. hope everything is ok with you!!!

Answer 56

yeah everything is fine, let me know what you get

Answer 57

This is another one!!! you see how easy was?? jejeje!!

Answer 58

you got it, nice work (I just realized/remembered it checked your answer for you lol)

Answer 59

Jiji!!! thanks again for your help...Talk to you soon.. lol!!

Answer 60

np, cya later