Confidence Interval (Mean) ZyBooks 4.2 You're analyzing the data collected from the earthquake research project in Week 1. Your goal is to estimate the population mean of the frequency of earthquakes of all occurrences using the 95% confidence interval. See the attached Excel document. Calculate the earthquake frequency mean and standard deviation. Use z = 1.960 (Significance Level, = 0.05) and ZyBooks Example 4.2.1: Confidence interval for the frequency mean. 8 5 12 7 10 6 9 11 8 6 10 7 b1. What is the margin of error, m? b2. What is the 95% confidence interval? b3. Interpret this confidence interval