A doctor says the standard deviation of the lengths of stay for patients involved in a crash is 6.14 days ...

     A doctor   says the standard deviation of the lengths of stay for patients involved in a   crash is 6.14 days. A random sample of 20 patients involved in this type of   crash has a standard deviation of 6.5 days. At a= 0.05, can you reject the   doctor's claim? choices are reject doctor's claim, fail to reject claim.