Nationwide, the mean ACT score is 21.4.A survey of 25 Ohio scores showed a meanof 20.8.If the standard deviation for the sample is 3, can we conclude that Ohio is below the national average?Use the five-step testing method with = .05.

Another Question:

An exit poll found that 5,800 out of a sample of 10,000 voters who have a post-graduate education (i.e. attended graduate school) voted for Joe Biden in the 2020presidential election.Find the 99% confidence interval for the true population proportion of voters with a post-graduate education who voted for Joe Biden.