Question 9. Based on the following, should a one-tailed or two- tailed test be used? Họ: H = 17,500 HA: # 17,500 X= 18,000 S= 3000 n= 10 Question 10. Based on the following, should a one-tailed or two- tailed test be used? Họ: H = 91 HA: H > 91 X= 88 S= 12 n= 15