Monthly rent paid by undergraduates and graduate students. Undergraduate Student Rents (n = 10) 770 710 870 630 670 830 810 700 1, 060 710 Graduate Student Rents (n = 12) 1, 120 900 910 900 810 910 740 850 950 920 890 840 Click here for the Excel Data File (a) Construct a 98 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 for d.f. (Do not round the intermediate calculations. Round your final answers to 3 decimal places. Negative values should be indicated by a minus sign.) The 98% confidence interval is from (b) What do you conclude? O We cannot conclude there is a significant difference in means for undergraduate and graduate rent. O We can conclude there is a significant difference in means for undergraduate and graduate rent