To determine the median life span of certain species of animal is greater than 7 years a random sample of 22 observations were made and life span in years is the following:
11.3. 15.8. 9.1 8.1 7.3 4.4 10.4 2.5 6.6 7.6 24.9 30.1 3.9 7.2 20.1 3.1 6.1 4.9 19.4 14.2 22.1 18.2
Use significance level 10%