Suppose we want to test the null hypothesis Ho : p = 0.28 against the alternative hypothesis H1:p + 0.28. Suppose also that we observed 100 successes in a random sample of 400 subjects and the level of significance is 0.05. What is the observed test statistic for this test? Select one: а. -1.521 O b. 1.336 Ос. -1.336 d. 1.521

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