Hello! I understand that to solve this question you would have to find the test statistic and then the p value and compare it to alpha. However, how would you solve for the test statistic? Would the sample size be 100? would you do .50 - .39 over what ? Thanks !

15). Your friend claims that half of the cars on the road in Gainesville are American-made. You think that the actual proportion is smaller than this. To test your friend's claim, you observe 100 cars and find that 39 of them are American made. In a hypothesis test at a significance level of alpha = 0.05, what can you conclude? A) Accept the null hypothesis. B) Cannot be determined C) Reject the null hypothesis