A recent survey compared the monthly incomes of electrical engineers with that of civil engineers. A sample of 13 electrical engineers had an average income of 64K with a sample standard deviation of 5k. A sample of 15 civil engineers had an average income of 69k with a sample standard deviation of 3.9k. At the significance level of .05 can we conclude that there is a difference in the variance of the two types of engineers?
What is the null hypothesis?
What is the critical value of test tastistics
What is the calculated value of the test statistic
What is the decision