A civil engineer working in a geotechnical firm is interested in the distribution of the shear wave velocity (Vs) of certain type of weathered rock in the ground surface. The geotechnical firm...

Extracted text: A civil engineer working in a geotechnical firm is interested in the distribution of the shear wave velocity (Vs) of certain type of weathered rock in the ground surface. The geotechnical firm collected 36 samples from different sites with a mean (y) of 735 m/s and standard deviation (s) of 82 m/s. a. Calculate 90% confidence interval (CI) for the population mean µ. Write down your interpretation b. Calculate 95% confidence interval (CI) for the population mean µ. Write down your interpretation c. Calculate 99% confidence interval (CI) for the population mean µ. Write down your interpretation d. Explain why the size of CI changed between parts a - e