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Discussion file #15 The following is an output for square footage of homes in Albuquerque, separated into NE houses (X) and All Other (Y). What is the approximate upper 90% confidence limit for the difference in mean square footage between the two groups (X - Y)? Variable Obs Means Variance Std. Dev. NE (X) 78 1707 380000 616.441 All Other( Y) 39 1546 250691.52 500.6910 O a. 376.55 O b. 83.883 O c. 356.86 O d. 161.00 O e. 335.86