An institute conducted a clinical trial of its methods for gender selection

An institute conducted a clinical trial of its methods for gender selection. The results showed that 275 of 330 babies born to parents using a specific gender-selection method were boys. Use the sign test and a 0.05 significance level to test the claim that the method used is effective in increasing the likelihood of a boy.
a Since the test statistic falls within the critical region, reject the null hypothesis. There is sufficient evidence that the method used is effective in increasing the likelihood of a boy.
b Since the test statistic does not fall within the critical region, fail to reject the null hypothesis. There is insufficient evidence that the method used is effective in increasing the likelihood of a boy.
c Since the test statistic falls within the critical region, fail to reject the null hypothesis. There is sufficient evidence that the method used is effective in increasing the likelihood of a boy.
d Since the test statistic does not fall within the critical region, reject the null hypothesis. There is insufficient evidence that the method used is effective in increasing the likelihood of a boy.

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