Significant? Public health officials believe that 98% of children have been vaccinated against measles. A random survey of medical records at many schools across the country found that, among more than 13,000 children, only 97.4% had been vaccinated.

A statistician would reject the 98% hypothesis with a P-value of P 60.0001.

a) Explain what the P-value means in this context.

b) The result is statistically significant, but is it important?

Comment.