Question

Stats! How to know if this binomial distribution is approximately normal.

n=20
P=.2

Answer 1

But how do I know its distributed approximately normal.

Answer 2

If both np > 5 and n(1-p) > 5, then it's approximately normal

Answer 3

some books use a more strict guideline: np > 10 and n(1-p) > 10

Answer 4

Oh I recall learning that in class, thank you Jim_thompson. Also I noticed that I can't fan you

Answer 5

oh for some reason i blocked you in the past, i forget why. You're unblocked now though

Answer 6

lol XD

Answer 7

I don't really remember I did something wrong

Answer 8

I forget so I have no clue. I usually block if someone is harassing me or something

Answer 9

but np = 20*0.2 = 4 which is NOT greater than 5.

So np > 5 is false meaning that the binomial distribution is not approximately normal

Answer 10

to fix this, you would need to increase n

Answer 11

Ok

Answer 12

It doesn't actually tell me if I need to fix it, it's just a yes or no question

Answer 13

so it's just "no" because np = 20*0.2 = 4 which means np > 5 is false. You should check n(1-p) as well, but if one is false, then the whole thing doesn't work.

Answer 14

alright