If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Calculating the P-value in a z test for a proportion


A campaign manager for a political candidate released a series of advertisements criticizing the opposing candidate in an upcoming election. The opposing candidate previously had the support of 45% of voters, so the manager wants to test H0:p=0.45 versus Ha:p<0.45, where p is the proportion of voters that support the opposing candidate.
After running the advertisements, the campaign manager obtained a random sample of 500 voters and found that 200 of those sampled supported the opposing candidate.
Which of the following represents the P-value for their test?
Choose 1 answer: