find the value of P(x is less than or equal to 0) using a binomial distribution table with n equal to 8????? SO LOST

Question

mimi_x3 · Answer

Ok you have a stats book?

mimi_x3 · Answer

Umm also is this all the info they give you?
Should have provided you with a p-value

anonymous · Answer

IS THERE A P VALUE???

anonymous · Answer

sorry, got an answer but i need help with the last part of my last question…
p= 0.5 n=8, k=2
use the normal approximation to find P(x is greater or equal to 3). I found the exact value to be 0.855

anonymous · Answer

i got z= -1.06

anonymous · Answer

and i know i need to find one minus the area under the curve to the left of z 
but i  want to make sure z is correct first, secondly i have no idea how to find the area

perl · Answer

one moment reading

anonymous · Answer

thanks

perl · Answer

you want to find a normal approximation to P ( X > = 3 ) ?

perl · Answer

so using a normal distribution, we have to find 
P( X >= 2.5 ) , because binomial distribution uses discrete values

anonymous · Answer

my k value was 2 not 2.5 and it was correct

perl · Answer

yes im saying you need to use 2.5 , its a continuity correction factor

anonymous · Answer

oh. ok. sorry I'm really new to statistics.
I'm taking an intro class so needless to say I'm pretty lost

perl · Answer

P ( X >= 3) ~ P( z >= ( 2.5 - n*p)/sqrt(n*p*q))

perl · Answer

sure, no problem, you are approximating an exact binomial distribution problem with a 'normal' continuous distribution

anonymous · Answer

yes, i got z= -1.06.. is that correct?

perl · Answer

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