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LESSON 2. 1. Read each item carefully and choose the letter of the best answer. 1. If the level of confidence is 88% then what is the value of the significance level, a ? A. 22% B. 88% C. 0.12 D. 0.12% 2. What is the formula in finding the confidence interval for the population mean with unknown variance? A. Ken B. X-1 C. At D. 3. What is the value of tens if the degree of freedom is 187 A. 1.740 B. 1.734 C. 1.720 D. 1.729 4. A random sample of 12 students from a large university yields mean GPA of 2.71 with sample * standard deviation of 0.51. At 90% confidence level. what is the maximum error of the estimate? Assume that the numerical population of GPAs from which the sample is taken has a normal distribution. A. 0.264 B. 0.201 C. 0.199 D. 0.262 5. What is the confidence interval for the population mean of the problem number 4 above? A. (2.448, 2.972) C. (2.509, 2.911) B. (2.511, 2.909) D. (2.446, 2.974) HI. A random sample is drawn from a normally distributed population of unknown standard deviation. Construct a 90% confidence interval for the population mean based on the information given