Question

You want to look at how old people are when they get their first job. You make a 95% confidence interval for the difference in the average age people started working for people who got their first job in 1950 and the average age people started working for people who got their first job in 2010. With population one being people who got their first job in 2010, you get the confidence interval (1.2, 4.8). Interpret this confidence interval. Choose the best option.

A. People whose first job was in 2010 started working at an average age that was 1.2 to 4.8 years younger than that average age of those whose first job was in 1950.

B. We are 95% confident that the actual mean is in this interval

C. People started their first job, on average, somewhere between 1.2 and 4.8 years

D.People whose first job was in 2010 started working at an average age that was 1.2 to 4.8 years older than that average age of those whose first job was in 1950.

Answer 1

Since the confidence interval is positive, we can say that, therefore, people whose first job was in 2010 started working at an average age that was 1.2 to 4.8 years younger than that average age of those whose first job was in 1950.

A. option is correct.