A university administrator writes down a report in which he describes that at least 45% of all students have driven while under the affect of drugs or alcohol. Many others think the correct percent is less than 45%. What are appropriate null as well as alternative hypothesis in this condition?
A) ?-hat = 0.45 vs. Ha: ?-hat < 0.45
B) ?-hat = 0.45 vs. Ha: ?-hat ? 0.45
C) ? = 0.45 vs. Ha: ? < 0.45
D) ? = 0.45 vs. Ha: ? ? 0.45