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Lesson 2 Length of Confidence and Appropriate Sample Size What's In A. Fill in the blank with the correct word or group of words to make a meaningful statement. Write your answer on a separate sheet of paper. 1. Statistically, rounding up of 111.12 is 2. A confidence level is the confidence coefficient and is expressed as 3. For a 95% confidence level, the confidence coefficient is 4. When a 99% confidence level is selected, a = 5. The standard deviation of a sampling distribution is called 6. A subset of the interest population is called B. Answer the following: 1. 1 - 0.38 4. (1.96)(5.3) 2 0.2 5. (2.58) (2.5) 2 2. (0.35) (0.65) 0.10 3. 1.96(2) 0.06 9C. Find the length of the confidence interval given the following, data: (s - sample standard deviation). Show your solutions. 1. s = 2.36, n = 350, confidence level: 99% 2. s = 3.35, n = 250, confidence level: 99% 3. s = 3, n = 275, confidence level: 95% 4. S = 6, n = 425, confidence level: 98% 5. s = 9, n = 501, confidence level: 99% D. Determine the sample size, given the following data: (s - sample standard deviation). Show your solutions. 1. s = 5, E = 2.45, confidence level: 95% 2. S = 7, E = 3.65, confidence level: 98% 3. s = 4, E = 2.76, confidence level: 99% 4. s = 8, E = 2.22, confidence level: 95% 5. s = 3.3, E = 1.03, confidence level: 99%What's More Activity 2 A. Round up the following calculated sample size. Show your solutions. 4. n = 644.041 1. n = 507.49 5. n = 932.63 2. n = 247.51 3. n = 1, 276.08 B. Find the length of the following confidence interval. 1. 0.241