Parameter Data Entry Worksheet Features 
Random uncertainty in measurements made using measuring (MTE) and/or subject (SU) parameters can be estimated by entering limits and confidence levels into the error source table of Measurement Process Uncertainty Worksheet.  Alternatively, random uncertainty can also be calculated statistically by entering measurement results into the built-in Parameter Data Entry Worksheets, which are accessed by clicking the MTE Random and SU Random buttons on the Measurement Process Uncertainty Worksheet.  The Parameter Data Entry Worksheets can also be accessed by selecting the Measurement Sample option on the Enter Data menu on the Measurement Process Uncertainty Worksheet  Parameter Data Entry Worksheet functions and features are described below.
 
Menu Bar

Data entries and associated statistics are accepted and the closed by selecting OK on the menu.  Conversely, new entries or changes are ignored and the screen closed by selecting Cancel on the menu.  Data entries can be cut, copied, pasted, or deleted via the Edit menu.  Rows in the measurement data table can also be inserted or deleted via the Edit menu. Selecting Run on the menu opens the Run External Application Screen, which can be used to launch external Windows applications from within AccuracyRatio.  

 
Data Entry Options 
Up to 200 values can be entered in the measurement data table.  Data can be entered either as measurement results in nominal units by selecting the Measurements option, or as deviations from nominal in parameter tolerance offset units by selecting the Deviations option.  For example, suppose the length of a gage block has a nominal or reported value of 5 cm.  Measurements taken on the gage block can be entered directly in terms of centimeters or as deviations from 5 cm in terms of mm.
 
If you already have samples of measurements stored on an external spreadsheet, you don't need to retype the results into the Parameter Data Entry Worksheet.  Data can be copied from the external application file into the Windows clipboard and pasted into measurement data table via the Run External Application Screen.

Sample Statistics
Computed statistics are displayed directly below the measurement data table.  If the Measurements option is selected, then the sample Mean Value is displayed.  If the Deviations option is selected, then the Mean Deviation is displayed.  The Sample Size and Standard Deviation are displayed for both options.  The Mode or Nominal Value entered into the Parameter Bias Uncertainty Worksheet is also displayed for reference. 

 
When the uncertainty in the mean value of the sample of measurements is of primary concern, then you want to set the random uncertainty equal to the Std Deviation of the Mean by checking the Use Std Deviation in the Mean box.  Mathematically speaking, the standard deviation of the mean is equal to the standard deviation divided by the square root of the sample size.