Myocardial blood flow (MBF) was measured for two groups of subjects after 5 minutes of bicycle exercise. The normoxia ("normal oxygen") group was provided normal air to breath whereas the hypoxia group was provided with a gas mixture with reduced oxygen, to simulate high altitude. The results (ml/min/g) are as follows and are plotted below:

(a) What is the null hypothesis for a t test here?
(b) What do the dotplots suggest about H0?
(c) Here is computer output for a t test. Explain what the P-value means in the context of this study.
t = 7.417, df = 12.212, p-value = 7.307e-06
alternative hypothesis: true difference in means is not equal to 0
(d) If a = 0.05, what is your conclusion regarding H0? State your conclusion in the context of the research.

79871880 pe 3 6521865 y65555443 sa 850 0599 938474 43221 400 3332222221020 Hypoxia Normoxia Oxygen