45. What is the length of the confidence interval given the following data: o = 0.5, n = 70, confidence level = 95%? A. 0.17 B. 0.18 C. 0.19 D. 0.23 46. Which formula is used in determining the minimum size needed when estimating the population mean? A. 2/2 B. C. E D. For numbers 47 to 49, refer to the given problem. A survey on 200 GAS students of Masipag Senior High School shows that they read on an average of 15. 7 hours per week. The margin of error is 2.4 hours at a 95% confidence level. 47. What is the value of the margin of error? А. 2.2 В. 2.4 С. 15.7 D. 16.3

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