A researcher wants to test if the mean body temperature of nurses working in the intensive care unit (ICU) is different from the normal value of 98.6F. He randomly selects 30 nurses from the ICU and measures their body temperature. The sample mean is 97.8F and the sample standard deviation is 2.6F. He wonders if there is enough evidence to reject the null hypothesis using a 0.05 level of significance. In this scenario, Which hypotheses / claim are most appropriate to reduce the chances of a type I error while answering this question? A. H0: = 98.6, Ha: < 98.6 B. H0: = 98.6, Ha: > 98.6 C. H0: = 98.6, Ha: 98.6 D. Increasing the alpha level (often 0.05) reduces a Type I error