part $2$: Computer Generated Graphs

This part will allow you to familiarize yourself with the Logger Pro Software.

PLOT two graphs: $y$ vs $x$ and $lny$ vs $x$ and FIT the appropriate functions for each graph.

DO NOT forget to add the name of each partner to the graphs. You can do so by choosing to

add a footer in the Print options at the time of printing.

The following steps can be used as guidelines for plotting graphs using the Logger Pro software.

$($i$)$ To plot the $y$ vs $x$ graph, enter the values of $x$ and $y$ from the data table.

$($ii$)$ Using "Curve Fit" in the Analyze drop$-$down menu, select the appropriate type of

function you want to try for this graph.

$($iii$)$ Double click on the graph to enter the Title and axes labels. Then print the graph.

$($iv$)$ To plot the $ln$ y vs graph, calculate $($ln y$)$ using "New Calculated Column" from the

Data drop$-$down menu.

$($v$)$ Make a plot of $lny$ vs x $,$ with their $5\%$ error bars shown on the plot. You can change

what is being graphed using the "Axis Options" tab in the Graph Options window.

Error bars are found under the "Options" tab in the Column Options window.

$($vi$)$ Fit a straight line to this plot and find the slope and the error in the slope. Always use

"Curve Fit" in the Analyze drop$-$down menu, even if the data is linear.

$($vii$)$ Print this graph using the Print Graph option. Make sure that the values of the slope

and the error in the slope are clearly visible on the printout.

Make sure that you are familiar with all these procedures and that your plots are as you would

expect them to be$.$ If you are not sure, try again until you feel comfortable using this software to

manipulate data entered in columns, produce graphs $($multiple plots on the same graph and

multiple graphs for different data sets$),$ fit straight lines, and obtain parameters of the fit along

with their errors. To SAVE PAPER, print the graphs only when they are satisfactory.

$(1)$ What is the slope of the In $y$ vs $x$ graph calculated by the computer? Its uncertainty?

$1\mathrm{.}00+-0$

$(2)$ Does the slope of your hand$-$graph agree with the value given by the computer?

$(3)$ What is the percentage difference between the two?