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=?

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

Let's start with part a)

$\displaystyle p_1 = \frac{x_1}{n_1}$ and $\displaystyle p_2 = \frac{x_2}{n_2}$ then

$\displaystyle p_{pooled} = \frac{p_1\times n_1+p_2\times n_2}{n_1+n_2}$

What do you get?