Heather is given a sample and calculates the test statistic. using a level of significance of α = 0.05, she rejects the null hypothesis. heather's friends, alan and bill, also use the sample to calculate a test statistic. however, they differ in the level of significance they use. alan uses a level of significance of α = 0.1, while bill uses α = 0.01. all three students perform their calculations correctly.