A statistician was getting his car serviced at a dealership. He wondered if the average service cost for females was higher than for males. A random sample of 110 women had an average service cost of...

Question 9: give the hypotheses.


Extracted text: A statistician was getting his car serviced at a dealership. He wondered if the average service cost for females was higher than for males. A random sample of 110 women had an average service cost of $240 with a standard deviation of $20. A random sample of 120 men had an average service cost of $180 with a standard deviation of $100. Define the first population as men and the second population as women. Using a 5% significance level, determine if the average service cost for women is higher than men. Give the hypotheses. O Null: There is no average difference in what men and women pay for service costs at a dealership. Alternative: Women pay an average service cost higher than men. Null: There is no average difference in what men and women pay for service costs at a dealership. Alternative: Men pay an average service cost higher than women. O Null: There is no average difference in what men and women pay for service costs at a dealership. Alternative: The average service cost for men and women is not equal.