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7.23. Refer to Table 7. What were the degrees of freedom between (df treatment) in these analyses? *a. 2 b. 3 c. 47 d. 49 7.24. Refer to Table 7. Which of the following statements is true, based on information in Table 7? a. Mean dyspnea ratings were significantly higher with compressed air than with O,. b. Interaction effects were statistically significant. c. Mean SPO, values were significantly higher for the two intervention conditions than for the control condition. *d. One or more assumptions for the ANOVA for heart rate was likely violated