I got stuck on the last two (c &d) questions and need help im not sure what to do here im using excel as well to calculate this not manual.

Formulate and test hypotheses to determine if statistical evidence suggests that the graduation rate for (1) top liberal arts colleges or (2) research universities in the accompanying table exceeds 90%. Do the data support a conclusion that the graduation rates exceed 85%? Would your conclusions change if the level of significance was 0.01 instead of 0.05?
Top Liberal Arts Colleges Graduation %	Research Universities Graduation %	Is there sufficient evidence at the 0.05 level of significance that the graduation rate for top liberal arts colleges exceeds 90%? Determine the null hypothesis, H0, and the alternative hypothesis, H1.
94	70			A)	stand,dev	unknown
81	88
90	73				HO	m		90%				30
91	76				H1	m	>	90%
85	92
82	81
75	89
85	88				Step 1: Calculate the sample size for liberal arts
83	92				x1	84.28		90
89	88				s1	6.32798
72	84				n1 29
83	84
85	91			numer	-5.72
94	90			denom	1.265596
82	87
77	77				t stat	-4.51961
73	74							The p-value is greater than the chosen value of a , so do not reject the null hypothesis. There is insufficient evidence to conclude that the mean is greater than 90%
79	71
88	86				P value	0.999952
88	89
85	59			B)	Is there sufficient evidence at the 0.05 level of significance that the graduation rate for top liberal arts colleges exceeds 85%? Determine the null hypothesis, H0, and the alternative hypothesis, H1.
76	74
88	75
91	93				HO	m		85%		85
91					H1	m	>	85%
					numer	-0.72
					denom	1.265596
					t stat	-0.5689
								The p-value is greater than the chosen value of a , so do not reject the null hypothesis. There is insufficient evidence to conclude that the mean is greater than 85%.
					P value	0.713099
				c)	Is there sufficient evidence at the 0.01 level of significance that the graduation rate for top liberal arts colleges exceeds 90%????
					D)	Is there sufficient evidence at the 0.01 level of significance that the graduation rate for top liberal arts colleges exceeds 85%????