Flammability tests were conducted on children's sleepwear. The Vertical Semi restrained Test was used, in which pieces of fabric were burned under controlled conditions. After the burning stopped, the length of the charred portion was measured and recorded. Results are given in the margin for the same fabric tested at different laboratories. Because the same fabric was used, the different laboratories should have obtained the same results. Did they? Use a 0.05 significance level to test the claim that the different laboratories have the same population mean.
Laboratory 
1 
2 
3 
4 
5 
2.9 
2.7 
3.3 
3.3 
4.1 
3.1 
3.4 
3.3 
3.2 
4.1 
3.1 
3.6 
3.5 
3.4 
3.7 
3.7 
3.2 
3.5 
2.7 
4.2 
3.1 
4.0 
2.8 
2.7 
3.1 
4.2 
4.1 
2.8 
3.3 
3.5 
3.7 
3.8 
3.2 
2.9 
2.8 
3.9 
3.8 
2.8 
3.2 
3.1 
4.3 
3.8 
2.9 
3.0 
3.4 
3.5 
2.9 
3.3