Question: Fabric Flammability Tests in Different Laboratories. Flammability tests were conducted on children’s sleepwear. The Vertical Semirestrained 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. The same fabric samples were tested at five different laboratories. The analysis of variance results from Excel are shown below.
a. What is the null hypothesis?
b. What is the alternative hypothesis?
c. Identify the value of the test statistic.
d. Find the critical value for a 0.05 significance level.
e. Identify the P-value.
f. Is there sufficient evidence to support the claim that the means for the different laboratories are not all the same?