Test the Claim That $\sigma = 18.63 \text { if } \mathrm { n } = 12 , \mathrm {~s} = 17.1 , \text { and } \alpha = 0.05$

Essay

Test the claim that $\sigma = 18.63 \text { if } \mathrm { n } = 12 , \mathrm {~s} = 17.1 , \text { and } \alpha = 0.05$ Assume that the population is normally distributed.