You survey 300 people and find out that 75 of them have been

You survey 300 people and find out that 75 of them have been to a concert in the last year. You want to compare this to the 10% value known for the US population. What test will you use:

Solution

Answer: a one population z-test for the percent

When you want to compare the proportion of something, you need to use Z-test, not t test.