1) Listed below are grade averages for randomly selected students with three different categories of high-school background. At the 0.05 level of significance, test the claim that the three groups have the same median grade average. State the hypotheses Ho and Ha:

A) H0: The three groups come from populations which have different median grade averages.
     H1: The three groups come from populations which have the same median grade average.
B) H0: The three groups come from populations which have the same mean grade average.
     H1: The three groups come from populations which don't have the same mean grade average.
C) H0: The three groups come from populations which have the same variation in grade average.
     H1: The three groups come from populations which don't have the same variation in grade average.
D) H0: The three groups come from populations which have the same median grade average.
     H1: The three groups come from populations which don't have the same median grade average.