A Man Who Needs an Operation Would Like to Evaluate $\sigma \neq 0.08$

Essay

A man who needs an operation would like to evaluate the variation in survival rates in different hospitals for his type of operation. He hypothesizes that the standard deviation of survival rates at all hospitals is 0.08 . Test this hypothesis against the alternative hypothesis $\sigma \neq 0.08$ if a random sample of 12 hospitals produces a standard deviation of 0.11 . Use $\alpha=0.10$ .