## 29.6 Conclusions

The one-tailed $$P$$-value is $$0.0635$$, suggesting only slight evidence supporting $$H_1$$. To write a conclusion, an answer to the RQ is needed, plus evidence leading to that conclusion; and some summary statistics, including a CI (indicating the precision of the statistic):

Slight evidence exists in the sample (paired $$t=1.68$$; one-tailed $$P=0.0635$$) of a mean energy saving in the population (mean saving: 0.54 MWh; $$n=10$$; 95% CI from $$-0.19$$ to $$1.27$$ MWh) after adding the insulation.

The wording implies the direction of the differences (by talking of ‘savings’). Of course, statistically validity shoud be checked; this was done in Sect. 23.9, but the validity conditions are given again in the next section, for completeness.