Soil samples from nine locations at a site are taken to
determine the bearing capacity in kN/m^2. The results are
summarized:
23.1, 42.4, 30.3, 31.0, 28.4, 39.3, 32.4, 27.4, 38.0
(a) Estimate the mean, standard deviation, and COV of the
data
(b) Compute the standard error of the mean.
(c) Establish 95 percent confidence intervals for the mean.
(d) Using the COV from (a) how many samples must be tested to
have +/- 10 percent error for the mean at...