p value? critical z value? test statistic? help please=(

• July 19th 2012, 09:23 AM
numbaoneazn1
p value? critical z value? test statistic? help please=(
Critical z value and p value help please?
Use a significant level of a=0.01 to test the claim that p1=p2. use the given sample sizes and numbers of successes to find (a) pool estimated p (b) the z test statistic (c) the critical z values and (d) the p value.

Treatment group Placebo group
n1=500 n2=200
x1=100 x2=50

p=?
z=?
critical z value=?
p-value=?
• July 19th 2012, 01:41 PM
pickslides
Re: p value? critical z value? test statistic? help please=(
$p_1 = \frac{x_1}{n_1}$ and $p_2 = \frac{x_2}{n_2}$ then
$p_{pooled} = \frac{p_1\times n_1+p_2\times n_2}{n_1+n_2}$