A random sample of 16 students is taken from a larger normal population of students in a multi-lecture course and the sample mean (average) of their final grades is found to be 62.25. Suppose it is known that the sample standard deviation is 3.2. You wish to create a 98% confidence interval for the true population mean. Which of the following statements is most correct? a. The tα/2,n-1 (found from R) used to calculate the 98% confidence interval is 2.946713. b. The tα/2,n-1 (found from R) that is needed to calculate the 98% confidence interval is 2.60248. c. The tα/2,n-1 (found from R) used to calculate the 98% confidence interval is 2.24854. d. The tα/2,n-1 (found from R) used to calculate the 98% confidence interval is 0.01.

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