The San Andreas Fault One of the most famous large fractures (cracks) in the earth’s crust is the San Andreas fault in California. A geologist attempting to study the movement of the earth’s crust at a particular location found many fractures in the local rock structure. In an attempt to determine the mean angle of the breaks, she sampled n = 50 fractures and found the sample mean and standard deviation to be 39.8° and 17.2°, respectively. Estimate the mean angular direction of the fractures and find the margin of error for your estimate.
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