A geologist intending to study the movement of relative changes in the earth's crust at a particular site
changes in the earth's crust at a particular site, in an attempt to determine the average
the mean fracture angle, selected 51 fractures. The selected fractures recorded a mean of 39.8 degrees and a standard deviation of 17.2 degrees.
Assuming normality of the population:
(a) With 90% confidence construct an interval for the population mean.
(b) With 90% confidence construct an interval for the population standard deviation.
population standard deviation.