If question B is t test i need the degree of freedom

Espanol A decade-old study found that the proportion, P, of high school seniors who believed that "getting rich" was an important personal goal was 75%. A researcher decides to test whether or not that percentage still stands. He finds that, among the 225 high school seniors in his random sample, 179 believe that "getting rich" is an important goal. Can he conclude, at the 0.05 level of significance, that the proportion has indeed changed? Perform a two-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas. (a) State the null hypothesis H, and the alternative hypothesis H. H :1 M X S H :1 (b) Determine the type of test statistic to use. [Choose one) 0=0 050 020 (c) Find the value of the test statistic. (Round to three or more decimal places.) X ? (d) Find the two critical values. (Round to three or more decimal places.) [ and (e) Can we conclude that the proportion of high school seniors who believe that "getting rich" is an important goal has changed? Yes ONo