HP 35s HP 35s scientific calculator - User Guide - Page 172
Sample Standard Deviation
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Four data pairs accumulated. Calculates the mean price weighted for the quantity purchased. Sample Standard Deviation Sample standard deviation is a measure of how dispersed the data values are about the mean sample standard deviation assumes the data is a sampling of a larger, complete set of data, and is calculated using n - 1 as a divisor. Press for the standard deviation of x-values. Press for the standard deviation of y-values. The (σ) and (σ) items in this menu are described in the next section, "Population Standard Deviation." Example: Sample Standard Deviation. Using the same process-times as in the above "mean" example, May Kitt now wants to determine the standard deviation time (sx) of the process: 15.5 9.25 10.0 12.5 12.0 8.5 Calculate the standard deviation of the times. (Treat all the data as x-values.) Keys: () Display: Description: Clears the statistics registers. Enters the first time. Enters the remaining data; six data points entered. Calculates the standard deviation time. 12-6 Statistical Operations