Spam: A researcher reported that 71.8% of all email sent in a recent month was...
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Spam: A researcher reported that 71.8% of all email sent in a recent month was spam. A system manager at a large corporation believes that the percentage athis company may be 78%. He examines a random sample of 500 emails received at an email server, and finds that 370 of the messages are spam. Can youa= 0.05 levels of significance and the critical value method with the table.78%conclude that less than of emails are spam? Use both a 0.01andPart 1 of 5State the appropriate null and alternate hypotheses.Ho: p= 0.78H?: p< 0.78This hypothesis test is a left-tailedPart: 1 / 5Part 2 of 5test.Find the critical values. Round the answers to three decimal places.For a= 0.01, the critical value isFor a= 0.05, the critical value isX5
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