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11-15 A veterinarian collects data on the number of times race horses are raced during their career. The researcher finds the average number of races a horse enters is x = 15.3 with a standard deviation of s = 6.8 in a sample of n = 20 horses. Suppose the number of times horses are raced follows a normal distribution. 12. Suppose a confidence interval is to be constructed to estimate the mean number of times all horses are raced. Find the critical value for the 98% confidence level. (Hint: use your answer in 13 & 14 below to determine the chart to use). (a) 19 (b) 2.861 (c) 2.539 (d) 1.729