11 No Test Explain whether we can use the z test for a proportion in these situations a You toss a coin 10 times in order to test the hypothesis Ho p 0 5 that the coin is balanced b A local candidate contacts an SRS of 900 of the registered voters in his district to see if there is evidence that more than half support the bill he is sponsoring c A college president says 99 of the alumni support my firing of Coach Boggs You contact an SRS of 200 of the college s 15 000 living alumni to test the hypothesis Ho p 0 99