Do a two-sample test for equality of means assuming unequal variances. Calculate the p-value using Excel. (a-1) Comparison of GPA for randomly chosen college juniors and seniors: T1 = 4.25, $1 = .20, n1 = 15, 2 = 4.6, $2 = .30, n2 = 15, a = .025, left-tailed test. (Negative values should be indicated by a minus sign. Round down your d.f. answer to the nearest whole number and othe answers to 4 decimal places. Do not use "quick" rules for degrees of freedom.) d.f. t-calculated p-value t-critical (a-2) Based on the above data choose the correct decision. O Reject the null hypothesis O Do not reject the null hypothesis (b-1) Comparison of average commute miles for randomly chosen students at two community colleges: $1 = 21, $1 = 5, n1 = 22, 12 = 28, $2 =7, n2 = 19, a =.05, two-tailed test. (Negative values should be indicated by a minus sign. Round down your d.f. answer to the nearest whole number and othe answers to 4 decimal places. Do not use "quick" rules for degrees of freedom.) d.f. t-calculated p-value t-critical (b-2) Based on the above data choose the correct decision. O Do not reject the null hypothesis O Reject the null hypothesis(c-1) Comparison of credits at time of graduation for randomly chosen accounting and economics students: T =147, 5. =28, n, =12, 29 =143, 5, =27 n, =17, a = 05, right-tailed test. (Negative values should be indicated by a minus sign. Round down your d.f answer to the nearest whole number and other answers to 4 decimal places. Do not use "quick" rules for degrees of freedom.) d.f. t-calculated p-value t-critical (c-2) Based on the above data choose the correct decision. ) Reject the null hypothesis ) Do not reject the null hypothesis