What's the answer?

Toronto, Montreal and Vancouver accounted for 30% of Canadian retail sales in a recent year. You interview a random sample of Canadian residents this year to see whether that proportion has changed. Suppose that all assumptions are met and you test the hypothesis H0 : p = 0.3 vs. H A : p 7e 0.3. A sample of size 500 results in a sample proportion of 0.25. (hint: we know 02 = 0.2l) 1. What is the standard deviation of the sample proportion? 2. Compute the value of the z-statistic. 3. Find the pvalue associated with this 2 statistic. 4. State your conclusion at or = 0.05