According to the 2004 Canadian Community Health Survey,23.1% of Canadians aged 18 or older were considered obese; that is,they had a body mass index (BMI)of 30 or higher.Suppose you believe that the percentage of obese Canadians has decreased since 2004 and wish to test your belief.A current survey in 2014 of 1000 random Canadians found that 219 were obese.State the critical value required to perform an appropriate hypothesis test using α = 0.05.
A)-1.645
B)-1.96
C)1.96
D)1.282
E)1.645

Question

Quizplus · Accepted Answer

The critical value for a one-tailed z-test at α = 0.05 is -1.645 when testing if the proportion has decreased.