*4.3.1 Decision on the hypothesis*

The six profiles considered along with the direction west to east have different calculated t-values (measure the size of the difference relative to the variation in sample data) and p-values (calculated probability) even though they were all computed with the same confidence interval, and this may be evident that the changes along each profile section are not the same. Only profile line A-A<sup>0</sup> has a p-value that is less than 0.05; hence, the null hypothesis is rejected meaning that there is significant variation in the depth range of the 2008 data and that of 2014. The remaining five profiles have p-value greater than 0.05; it implies that there is no significant difference on the changes along each of the profile line, and there could be changes inherent in the profiles that needed a further test to discover it. Hence, the null hypothesis is rejected for profile A-A<sup>0</sup> and conversely accepted for the five profile lines from B-B<sup>0</sup> to F-F<sup>0</sup> . The implication is that there was significant change along this profile (A-A<sup>0</sup> ) and it is different from the rest of the profiles B to F.
