A Random Sample of 60 Mathematics Majors Spent an Average

Multiple Choice

A random sample of 60 mathematics majors spent an average of $200.00 for textbooks for a term, with a standard deviation of $22.50. A random sample of 40 English majors spent an average of $180.00 for textbooks that term, with a standard deviation of $18.30. Calculate a 90% pooled confidence interval for the difference in average amounts spent on textbooks (math majors - English majors) .

A) (12.91, 27.09)
B) (11.50, 28.50)
C) (13.19, 26.81)
D) None of the above