Question: Tennis Fans:

the tennis industry association stated that the average age of a tennis fan is 32 years old. To test this claim, a researcher collected a random sample of 18 tennis fans and found that the mean of their ages 31.3years old and the standard deviation was 2.8 years. At a=.05 does it appear that the national average is lower than that was stated by the tennis industry association? Use the p- value method and assume the variable is approximately normally distributed.