Left right or two tailed? Critical values? Test statistic and p value? Fail to reject or reject?

A hospital spokesperson claims that the standard deviation of the waiting times experienced by patients in its minor emergency department is less than 0.5 minute. A random sample of 25 waiting times has a standard deviation of 0.4 minute. Use a 0.10 significance level to test the claim that the waiting time is less than 0.5 minute