Refer to the Environmental Geology (Vol. 58, 2009) simulation study of how far a block from a collapsing rock wall will bounce down a soil slope, Exercise 2.29. Rebound lengths (in meters) were estimated for 13 rock bounces. The data are repeated in the table below. A MINITAB analysis of the data is shown in the printout on p. 339.

a. Locate a 95% confidence interval for σ² on the printout. Interpret the result.
b. Locate a 95% confidence interval for σ on the printout. Interpret the result.
c. What conditions are required for the intervals, parts a and b, to be valid?

Data from Exercise 2.29

In Environmental Geology (Vol. 58, 2009) computer simulation was employed to estimate how far a block from a collapsing rock wall will bounce—called rebound length—down a soil slope. Based on the depth, location, and angle of block-soil impact marks left on the slope from an actual rock fall, the following 13 rebound lengths (meters) were estimated. Compute the mean and median of the rebound lengths and interpret these values.

Transcribed Image Text:

ROCKFALL 10.94 13.71 11.38 7.26 17.83 11.92 11.87 5.44 13.35 4.90 5.85 5.10 6.77