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In: Statistics and Probability

NYU is testing out two different versions of filtering software in order to reduce spam emails....

NYU is testing out two different versions of filtering software in order to reduce spam emails. The old version is called "Spam-A-Lot" and the new version is called "Spam-A-Little." In testing each version of the software the following data was produced:

Email Account Solicited Mail Unsolicited Mail TOTAL
Spam-A-Lot 305 95 400
Spam-A-Little 150 38 188

Let p1 and p2 denote the true proportion of unsolicited mail that make it through the "Spam-A-Lot" and "Spam-A-Little" filters, respectively.

(a) Determine the unbiased point estimates of p1 and p2:

(b) Explain why the formula for a large-sample confidence interval estimate for p1 - p2 can be used in this case.

(c) Build a 95% confidence interval for the true decrease in proportion p1 - p2 of unsolicited mail by switching filters from "Spam-A-Lot" (p1) to "Spam-A-Little" (p2), using the sample values given. Record results to 4 decimals.

(d) Based on your answer to (c), has the new filtering program reduced the amount of spam?

(e) Complete the following to perform a hypothesis test at the 5% significance level to test the claim that switching to the new filter "Spam-A-Little" has decreased the proportion of unsolicited emails getting through the filter.

i) H0:

Ha:

Level of Significance:

Observed Test Statistic (z-statistic):

ii) p-value:

Decision with justification:

Conclusion in context:

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