Question

Find the P-value

see attachment.

Answer 1

I at least need to know what x=? so then i can find the P-value. I thought it was 25 but the end answer keeps coming out wrong.

Answer 2

sorry took so long
http://en.wikipedia.org/wiki/Statistical_hypothesis_testing#Common_test_statistics
use formula for 1 proportion z-test

p = 25/800
p_o = 0.019

Answer 3

THANK YOU! I'll try the rest and let you know what i get.

Answer 4

p=25/800=0.03 right?
so then i do
\[z _{0}=\frac{ 0.03-0.019 }{ \sqrt{\frac{ 0.019(1-0.019) }{ 800 }} }\]

Answer 5

yes except i wouldnt round that much.....25/800 = 0.03125

Answer 6

then look up z in a z-table to find p-value

Answer 7

So if i am doing this right then the answer is 2.54 then i look up 2.5 &0.04 it the z-table?

Answer 8

yes

Answer 9

ok then the P-value is 0.9945= rounded to the three decimal place is 0.995?

Answer 10

oh sorry i should have mentioned, p-value here refers to probability in the tail P(Z>2.54)
the table gives probability P(Z<2.54)

p = 1-.9945 = .0055

low p-value means reject null hypothesis...in other words the sample of .03125 is statistically greater than .019 so you can conclude the alternative hypothesis

Answer 11

low means its lower than alpha (a=.05)
.0055 < .05

Answer 12

P-value= 0.006