An independent-samplesttest was conducted to compare high-altitude exercise to exercise at sea-level. Imagine the mean comfort level of participants, rated on a 7-point scale where high values reflect high comfort, at high altitude was 3.5 while the average at sea-level was 5.1. Imagine also that values were calculated forsdifferenceof 1.1, 2.04 for pooled variance, and 35 for degrees of freedom total.

The value of the test statistic is:

The appropriate confidence interval for this test is:

What are the critical cutoffs for this test?