Deviation is Unknown A. Using the t-table, give the confidence coefficients for each of the following. (5points) Given t-value 1. n=12,95% CL 2.201 2. n=15,95% CL 2.145 3. n=21,99% CL 2.845 4. n=23,95% CL 2.074 5. n=25,99% CL 2.797 B. Assuming that the samples come from normal distributions, find the margin of error E given the following: (10points) Given t-value 1. n=10, X=25,s=3.8,90% CL 2.20 2. n=16, X=48, s=4.4,95% CL 2.34 3. n=20, X=61,s=2.3,90% CL 0.89 4. n=23, X=83,s=3.3,95% CL 1.43 5. n=25, X=92.8, s=2.8,99% CL 1.57 C. Using the information in letter B, find the interval estimates of the population mean. (15points) Given Interval estimates 1. n=10, X=25,s=3.8,90% CL 22.80 - 27.20 2. n=16, X=48, s=4.4,95% CL 45.66 - 50.34 3. n=20, X=61,s=2.3,90% CL 60.11 - 61.89 4. n=23, X=83,s=3.3,95% CL 81.57 - 84.43 5. n=25, X=92.8,s=2.8,99% CL 91.23 - 94.37 D. The mean scores of a random sample of 17 students who took a special test is 83.5. If the standard deviation of the scores is 4.1, and the sample comes from an approximately normal population, find the t-value, margin of error and interval estimates of the population mean adopting a confidence level of 95%. (5points) t - value 2.120 margin of error ( E) 2.11 interval estimates (X + E) 81.39 - 85.61