Question 10.202

8. A random sample of 49 young persons with college degrees had a mean salary of $30,000 with a standard deviation of $5000. An independent random sample of 36 young persons without college degrees had a mean salary of $25,000 and a standard deviation of $4000.

  1. Test, at level of significance , whether the population mean salary of college graduates is greater than the population mean salary of those without a degree .
  2. Construct and interpret a 90% confidence interval for .