Question 9 0 / 2 pts Among a random sample of 21 extended family members, the average number of holiday gifts purchased each year is 17 with a standard deviation of 6.7. What is the lower bound of a 99% confidence interval for the average number of holiday gifts purchased by each member of this family? Even though we cannot give a partial gift, for this question, please round your answer to 2 decimal places. Use the appropriate score from below: z-score for a 99% CI = 2.58 z-score for a 98% CI = 2.33 z-score for a 95% CI = 1.96 z-score for a 90% CI = 1.64 T.INV.2T(0.05,20) = 2.086 T.INV.2T(0.05,21) = 2.080 T.INV.2T(0.05,22) = 2.074 T.INV.2T(0.05,23) = 2.069 T.INV.2T(0.05,24) = 2.064 T.INV.2T(0.01,20) = 2.845 T.INV.2T(0.01, 21) = 2.831 T.INV.2T(0.01, 22) = 2.819 T.INV.2T(0.01, 23) = 2.807 T.INV.2T(0.01,24) = 2.797