Question

Statistics Help. Please.

Answer 1

No

Answer 2

that's bad ishaan. you're supposed to be a sir :P haha..ill help if i can! :DDD

Answer 3

I thought he was going to gtfo or something, lol. I love memebase.

Answer 4

:okay:

Answer 5

It's Sampling Distributions.
And adult IQ test has scores with distribution N(100,15). If you pick an adult at random, what is the probability that (s)he will have a score above 120 on this IQ test?

Answer 6

What does N(100, 15) means?

Answer 7

N=population number. 100= population mean. 15=population standard deviation

Answer 8

maybe this will help you http://answers.yahoo.com/question/index?qid=20100301204346AANPPiY
If you get it, then please do post the solution here.

Answer 9

ok. thank you.

Answer 10

@dumbcow

Answer 11

First find the z-score, this will tell you how many std deviations 120 is from the mean

z = (120-100)/15 = 1.33

Next find the probability that IQ > 120 by using a normal distribution table to look up the z-score
P(Z>1.33) = 1 - P(Z<1.33) = 1- 0.9087 = 0.091

so probability is about 9.1%

**Note, Excel will do this for you using function "Normdist(x,mean,std dev, true)"

Answer 12

Thank you SO much!!!

Answer 13

welcome