A wire manufacturer is very concerned about the consistency of the machines that produce wires and believes that the wires produced by machine A have a smaller variance in diameter than the variance in diameter from machine B. The sample variance of a sample of 16 wires from machine A is 0.0264. The sample variance of a sample of 19 wires from machine B is 0.048. Test the claim using a 0.05 level of significance. Let σ21 represent the population variance for machine A. Step 2 of 5 : Determine the critical value(s) of the test statistic. If the test is two-tailed, separate the values with a comma. Round your answer(s) to four decimal places.