From 7 concrete mixtures, a certain number of specimens of two sizes were made for compression tests. The table presents the results. Test the hypothesis that there is no difference between the strength of the specimens whose size is 10cm or 20cm Hint: Calculate the probability of obtaining the observed number of differences of the same sign, if the positive and negative differences occur with the same frequency in the original population. Probetas de 10 cm Proberas de 20 cm Mercla Tamuvio de Romenci media Tamaie de Renitencia media lo muestra IMN/m) lar muestra IMN/W) 133 21.2 B 214 6 27 15 6 12 18 11 21 12 9 7 11.3 270 316 42.6 50.7 63.4 16,0 4.3 E 72.5 - From 7 concrete mixtures, a certain number of specimens of two sizes were made for compression tests. The table presents the results. Test the hypothesis that there is no difference between the strength of the specimens whose size is 10cm or 20cm Hint: Calculate the probability of obtaining the observed number of differences of the same sign, if the positive and negative differences occur with the same frequency in the original population. Probetas de 10 cm Proberas de 20 cm Mercla Tamuvio de Romenci media Tamaie de Renitencia media lo muestra IMN/m) lar muestra IMN/W) 133 21.2 B 214 6 27 15 6 12 18 11 21 12 9 7 11.3 270 316 42.6 50.7 63.4 16,0 4.3 E 72.5