HP 12c Solutions Handbook

Also see for 12C: User guide Reference guide User guide Quick start guide Specifications

Contents

1041. Press CLEAR .2. Key in the first y-value and press . Key in the first x-value andpress . Repeat this step for each data pair.3. After all data pairs are input, press to obtain the correlationcoefficient (between y and ln x).4. Press 1 0 to obtain A in the equation above.5. Press to obtain B.6. To make a y-estimate, key in the x-value and press .Example 1: A manufacturer observes declining sales of a soon-to-beobsolete product, of which there were originally 10,000 units in inventory.The cumulative sales figures over a number of months, given below, maybe fit by a logarithmic cure of the form y = A + B (ln x), where y representscumulative sales in units and x the number of months since the beginning.How many units will be sold by the end of eighth months?Month 1 2 3 4 5 6Cumulative Sales (units) 1431 3506 5177 6658 7810 8592Keystrokes DisplayCLEAR143111.00 First pair data input.350622.00 Second pair data input.517733.00 Third pair data input.665844.00 Forth pair data input.781055.00 Fifth pair data input.859266.00 Sixth pair data input.