According to MessageLabs Ltd., 80% of all email sent in July 2010 was spam. A system manager at a large corporation believes that the percentage at his company may be greater than 80%, and he wants to run a hypothesis test to see if there is evidence to support his belief. He examines a random sample of 500 emails received at an email server and finds that 420 of the messages are spam. Calculate the test statistic. Keep as many decimal places as you can when you are working with the denominator. Round the final answer to two decimal places.

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Q: Step 2 of 3 :   Compute the value of the test statistic. Round your

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