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March 6, 2015

March 6, 2015

Posted by **Ben** on Sunday, November 21, 2010 at 8:19pm.

- Statistics -
**MathGuru**, Tuesday, November 23, 2010 at 8:44amYou will need to use a binomial proportion two-sample z-test using proportions.

Formula:

z = (p1 - p2)/√[pq(1/n1 + 1/n2)]

p1 = 106/265

p2 = 57/285

n1 = 265

n2 = 285

p = (p1 + p2)/(n1 + n2)

q = 1 - p

Convert all fractions to decimals. Plug those decimal values into the formula and find z. Once you have that value, you will be able to compare to the critical or cutoff value you find in the z-table at .01 level of significance for a one-tailed test (hint: you are looking at "greater than" in the alternate hypothesis).

I'll let you take it from here.

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