Plastic sheets produced by a machine are periodically monitored for possible fluctuations in thickness. If the true variance in thickness exceeds 5.0625 square millimeters, there is a call for concern about product quality. Thickness measurements for a random sample of ten sheets produced in a particular shift were taken, giving the following results (in millimeters):
226 226 232 227 225 228 229 225 230 234
Test, at the 5% significance level, the null hypothesis that the population variance is 5.0625 against the alternative that the population variance is greater than 5.0625.