b) Determine a research hypothesis and a null hypothesis. Choose the correct answer below. A. The research hypothesis is the mean of the sample population is less than the general population. The null hypothesis is the mean of the general population is less than the sample population. B. The research hypothesis is the means of the populations are the same. The null hypothesis is the means of the populations are not the same. C. The research hypothesis is the means of the populations are the same. The null hypothesis is the mean of the general population is less than the mean of the sample population. D. The research hypothesis is the means of the populations are not the same. The null hypothesis is the means of the populations are the same. Part 7 Assume that the distribution of means is approximately normal. Use the cutoff sample score on the comparison distribution at which the null hypothesis should be rejected from part (a). Determine the sample's Z score on the comparison distribution. Zequals enter your response here (Type an integer or a decimal rounded to two decimal places as needed.) Part 8 Decide whether to reject the null hypothesis. Explain. Choose the correct answer below. A. The sample score is not extreme enough to reject the null hypothesis. The research hypothesis is true. B. The sample score is extreme enough to reject the null hypothesis. The research hypothesis is supported. C. The sample score is extreme enough to reject the null hypothesis. The r