Researchers measured the free calcium concentration in blood platelets of 12 people with normal blood pressure and 25 people with high blood pressure. The results are given in the table.

Normal	High
95	124
108	136
123	133
115	132
80	123
130	147
110	136
98	152
108	122
107	179
97	201
106	124
	189
	176
	129
	143
	165
	153
	142
	120
	133
	178
	182
	183
	140

a. Test the hypothesis that the population variances for platelet calcium are equal for normal and high blood pressure. Use a critical value and alpha= 0.05. (State the null and the alternative hypothesis, determine a critical value, present a test statistic, and provide a p-value and your decision.)

b. Using your conclusion in part a, perform an appropriate test to determine whether platelet calcium means are significantly greater in the high blood pressure group than in the normal blood pressure group. Use alpha = 0.05.(State the null and the alternative hypothesis, determine a critical value, present a test statistic, and provide a p-value and your decision.)