The prices (in dollars) for a graphing calculator are shown below for 8 online vendors. Estimate the population standard deviation in price with 90% confidence. 
Definitions:
Numeric Ages
Refers to the actual number of years that have passed since a particular geological event or the formation of a rock.
Landslide
The sudden and rapid movement of a large amount of earth material, such as rock and soil, downslope due to gravity.
Unconformity
A surface of erosion or non-deposition that separates younger strata from older rocks, indicating a gap in the geologic record.
Conglomerate
A conglomerate is a coarse-grained sedimentary rock composed of rounded fragments larger than 2 mm in diameter, embedded in a matrix of finer particles and cement.
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