1)What statistical test should you use to address this question? Use appropriate graphical methods to help you decide. Clearly state the rationale for the choice of your test.

2)State the null and alternative hypotheses.

3)Conduct the test, report the appropriate p-value and formulate a conclusion. In addition to indicating whether or not you reject the null hypothesis, also state clearly in words what conclusion you draw from the results.

Children suffering from phenylketonuria [PKU) are unable to metabolize the protein phenylalanine. It has been suggested that an elevated level of serum pheny alanine increases a child's likelihood of mental deficiency. Two groups of children were evaluated. The 21 members of group 1 have average daily serum phenylalanine levels