In the experiment to find out the effect of curing time on compressive strength of concrete blocks, two samples of 14 blocks each were prepared identically except for curing time. The blocks in one sample were cured for 2 days, while the blocks in the other were cured for 6 days. The compressive strength of the blocks, in MPa, are presented below.
Cured 2 days 1287 1326 1270 1255 1314 1329 1318
1306 1310 1302 1291 1328 1255 1296
Cured 6 days 1301 1364 1332 1372 1321 1397 1349
1378 1341 1376 1396 1343 1399 1387
Can you conclude that the mean strength is greater for blocks cured 6 days?