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- genericname
- 2012-12-03 12:58:03
Oh! I see. As always, thanks! 
- bob bundy
- 2012-12-03 10:29:30
Arrrhhh! That's more like it. See picture of normal distribution graph.
And further down that page you'll find that 1.96 gives the right probability.
Values for the table cannot be easily calculated which is why people use the table.
Bob
- genericname
- 2012-12-03 09:41:20
Ah, the answers were mixed up. The answer is actually 1.96. How did they get that?
- bob bundy
- 2012-12-03 09:21:42
hi genericname,
I'm assuming this is a normal distribution problem.
I cannot make those figures (P = 0.025 and Z = 0.7) go together. Is there more to this problem or have I got the wrong model?
Have a look at the interactive normal curve / table at
http://www.mathsisfun.com/data/standard … table.html
Bob
- genericname
- 2012-12-03 06:50:36
Hi, the problem is:
Find Z.025; that is find Z which cuts off a right-hand tail probability 0.025
The "Z.025" part looks like this:
http://i.imgur.com/CnZdc.png (didn't know how to type it out)
The answer is .70, but I don't know how it was calculated.