In: Statistics and Probability
Strength of concrete: The compressive strength, in kilopascals, was measure for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows:
Block |
|||||
1 |
2 |
3 |
4 |
5 |
|
After 3 days |
1341 |
1316 |
1352 |
1355 |
1327 |
After 6 days |
1376 |
1373 |
1366 |
1384 |
1358 |
Can you conclude that the mean strength after three days differs from the mean strength after six days? Use the α = 0.05 level of significance.
Let us denote the difference
d = After 3 days - After 6 days
There is sufficient evidence to support the claim that the mean strength after three days differs from the mean strength after six days