What is the focus of the example Figure 7-1 in the section introducing the statistical technique of this exercise?

What is the focus of the example Figure 7-1 in the section introducing the statistical technique of this exercise?
In Figure 2 of the Azzolin et al. (2013, p. 242) study, did the nursing outcome activity tolerance change over the 6 months of home visits (HVs) and telephone calls? Provide a rationale for your answer.
State the null hypothesis for the nursing outcome activity tolerance.
Was there a significant difference in activity tolerance from the first home visit (HV1) to the fourth home visit (HV4)? Was the null hypothesis accepted or rejected? Provide a rationale for your answer.
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In Figure 2, what nursing outcome had the lowest mean at HV1? Did this outcome improve over the four HVs? Provide a rationale for your answer.
What nursing outcome had the highest mean at HV1 and at HV4? Was this outcome significantly different from HV1 to HV4? Provide a rationale for your answer.
State the null hypothesis for the nursing outcome family participation in professional care.
Was there a statistically significant difference in family participation in professional care from HV1 to HV4? Was the null hypothesis accepted or rejected? Provide a rationale for your answer.
Was Figure 2 helpful in understanding the nursing outcomes for patients with heart failure (HF) who received four HVs and telephone calls? Provide a rationale for your answer.
What nursing interventions significantly improved the nursing outcomes for these patients with HF? What implications for practice do you note from these study results?