Stats
Overview of Statistical and Probability Functions
Statistical Functions:
 Following is a table detailing the values in storage register
 R0-R5 while using the Sigma + or Sigma - functions.  You should
 use the Clear Sigma function (4,2 3,2) before beginning a new
 sequence of entries.  Entries are performed by entering the value
 for y, click ENTER (3,6), enter the value for x, click Sigma +
 (4,9) or Sigma - (4,2 4,9) as appropriate.

 Ŀ
   Value   Register
 Ĵ
 n            R0   
 Sigma X      R1   
 Sigma X     R2   
 Sigma Y      R3   
 Sigma Y     R4   
 Sigma X*Y    R5   
 

Statistical Results:
 Clicking RCL Sigma + (4,4 4,9) returns to Y and X the sum of the
 y and x entries.  Clicking Mean x (4,3 4,7) returns to Y and X
 the average of the y and x entries.  Clicking Standard Deviation
 (4,3 4,8) returns to Y and X the standard deviation of the y and
 x entries assuming they are a sample of the population.

 Linear regression can be performed on the sample data by clicking
 L.R.  (4,2 4,9) which returns to Y the the slope of the line and
 returns to X the y axis intercept of the line using the least
 squares method.

 Linear estimation can be performed on the sample data by entering
 into X a known value of x and clicking the Linear Estimation key
 (4,2 4,7) which returns an estimated value for y to X and a
 correlation coefficient to Y. The correlation coefficient can
 vary form -1 to +1 with -1 indicating that the sample data fits
 exactly a straight line with negative slope.  A correlation
 coefficient of +1 indicates that the sample data fits exactly a
 straight line with positive slope and a correlation coefficient
 of 0 indicates that the data can not be approximated by a
 straight line.

Probability Functions:
 The probability functions permutations and combinations can be
 calculated by entering the total number of items available to
 select from and clicking ENTER (3,6), entering the number of
 items to be selected and clicking P Y,X (4,2 3,7) to display the
 permutations of X from Y (ordered sets of X items from Y items),
 or clicking C Y,X (4,3 3,7) to display the combinations of X from
 Y (unique sets of X items selected from Y items).  Both Y and X
 must be non-negative integer numbers and Y must be greater than
 or equal to X.

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