A medical researcher wanted to compare two different methods (A and B) for measuring cardiac output (L/min). Method A is the "gold standard" but is invasive (involves inserting a catheter into the main heart artery). Method B is less accurate but is non invasive. To control for differences between persons, both methods are used on each person participating in the study. This allows measurements to be directly compared for each method, per individual. Cardiac output for 19 subjects was measured by both methods and some summary statistics of the data are summarized in the table below. Is there enough evidence to conclude that the cardiac output for method B is less than the cardiac output for method A on average at a significance level of 0.025. Cardiac Method n Average Standard deviation A 19 5.56 1.55 B 19 5.06 1.72 neeeeeeee wee-B) 19 \" Perform a statistical test. (a) What are the null and alternative hypotheses? 0 Hozp :