Standard X-Ray Machines Should Give Radiation Dosages Below 5

Multiple Choice

Standard x-ray machines should give radiation dosages below 5.00 mill roentgens.To test a certain x-ray machine a sample of 36 observations is taken with a mean of 4.13 m.and a standard deviation of 1.91 m.Calculate the appropriate test statistic to test the hypotheses.

A) -2.73
B) -3.78
C) -0.455
D) 3.78
E) 2.73