HP F2216A hp 33s_user's manual_English_E_HDPM20PIE56.pdf - Page 150
Sample Standard Deviation, Population Standard Deviation
UPC - 082916014555
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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 | {Uº} for the standard deviation of x-values. Press | {U¸} for the standard deviation of y-values. The {σº} and {σ¸} keys 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: { c {´} 15.5 9.25 10 12.5 12 8.5 | {Uº} Clears the statistics registers. ) Enters the first time. Enters the remaining data; six ) data points entered. UºU Calculates the standard ) deviation time. Population Standard Deviation Population standard deviation is a measure of how dispersed the data values are about the mean. Population standard deviation assumes the data constitutes the complete set of data, and is calculated using n as a divisor. Press | {σº} for the population standard deviation of the x-values. Press | {σ¸} for the population standard deviation of the y-values. 11-6 Statistical Operations