Monthly rent paid by undergraduates and graduate students.

Undergraduate Student Rents (n= 10)

780 760 900680 730

810 790 630 1,060 680

Graduate Student Rents (n= 12)

1,070 920 930 880 780 920

770 850 890 870 890 800

(a)Construct a 90 percent confidence interval for the difference of mean monthly rent paid by undergraduates and graduate students, using the assumption of unequal variances with Welch's formula ford.f.(Do not round the intermediate calculations.Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.)