A random sample ofn = 1,200 observations From a binomial population produced x = 439. (a) If your research hypothesis is that ,0 differs from 0.4, what hypotheses should you test? O H\": p : 0.4 versus Ha: p = 0.4 O HO: ,0 0.4 I (b) Calculate the test statistic and its p-value. (Round your test statistic to two decimal places and your p-value to four decimal places.)