The Statistics Keys
You can enter data into the statistics registers by using the [ ∑+ ] key. Before you can analyze the data, however, you must press the [ STAT ] key to display the STAT FUNCTIONS menu. Pressing [ STAT ] redefines the function keys and enables you to select the operation you want to perform.
The Statistics Menu
When you press [ STAT ], the STAT FUNCTIONS menu is displayed. You can then use the function keys to select from the statistics functions shown below.
{ CLR } - Clears the statistics registers and enables you to select 1- or 2- variable statistics
{ FRQ } - Enters number of occurrences of identical data values; entered as data when you press [ ∑+ ], or removed when you press [ INV ][ ∑+ ].
{ MN } - Calculates the mean
{ s } - Calculates the standard deviation
[ INV ] { s } - Calculates population standard deviation
{ --> } - Displays the menu selections shown below.
{ m-b } - Calculates slope-intercept (linear regression)
{ r } - Calculates correlation coefficient (linear regression)
{ y' } - Predicts a y-value (linear regression)
[ INV ] { y' } - Predicts an x value (linear regression)
{ SHW } - Displays sums calculated during data entry
{ --> } - Displays the previous selections shown above.
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