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Hharripool14y ago
Hi John,

Can you explain something to me please?

A 95% confidence level produces a 1.65 normal distribution value.
I can't understand how this value is produced. I know this means a 5% probability level but not how I extract the -1.65 value from the distribution table!!!

Help please?????
Mmuhaimin14y ago#1
Hi harri!

95% means 0.95, we must have arrived at 0.95 by adding "some value" to 0.5 (since d1 > 0). If we calculate that "value" by subtracting 0.5 from 0.95, we will have 0.45. Now just go to the Normal distribution table and see the corresponding value of 0.45, you'll get 1.65.

Hope john likes it ;)
Hharripool14y ago#2
Hi muhaimin,

Thanks for your response but if I look up 0.45 I get 0.1736?

I'm confused. Am I not using the table correctly?
Hharripool14y ago#3
Do I find 0.4505 and that is equal to 1.65?
I think so!
Mmuhaimin14y ago#4
yes harri, closer to 0.45 is 0.4505 and 0.4495, so it can either be 1.65 or 1.64.

Since the examiner rounds it to the lower side so do we.
Hharripool14y ago#5
Thanks Muhaimin, you helped solve my headache!
Much appreciated
Mmuhaimin14y ago#6
most welcome!
John MoffatJohn MoffatTutor14y ago#7
Good answer Muhalmin.
(Some of the exam/revision kits try to be clever and start approximating the tables, but there is no need to in the exam!)
Mmuhaimin13y ago#8
Thanks john, I would be pleased to help the other students as well if i get the opportunity to do so.

I would appreciate if you see my post (a question from pilot paper) which is still unanswered. I know your answer would be "Time constraints! time constraints! ;)" ....

Dear Harripool! if you can help me out? :)
Thanks
Ssukaina178613y ago#9
at 90% confidence level, is the value from the table 1,29???
Ddazhong070313y ago#10
You should find 0.9-0.5=0.40 (cell), then you roughly get 1.285.
John MoffatJohn MoffatTutor13y ago#11
correct :)
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