A decade-old study found that the proportion of high school seniors who felt that "getting rich" was an important personal goal was 70%. Suppose that we have reason to believe that this proportion has changed, and we wish to carry out a hypothesis test to see if our belief can be supported. State the null hypothesis Ho and the alternative hypothesis H, that we would use for this test. H :0 H X p H : I S OSO 0>0 020 0-0 0 0 X 5