Medicine and Clinical Studies A study in the British Medical Journal suggested that children who received a diagnostic CT scan using ionizing radiation were more likely to develop a cancer 10 years after radiation exposure. Newer CT scanners use less radiation.

Therefore, the increased risk for children today may be decreased. Independent random samples of hospital CT scans in the United States and England were obtained, and the amount of radiation for each was recorded (in mSV).

For the United States, n1 = 10 and s₁² = 1.075; for England n2 = 16 and s₂² = 2.786. Is there any evidence to suggest that the variability in CT radiation per scan is different for these two countries? Use a = 0.05 and assume normality.