Presentation on theme: "Experiment #2 Resistor Statistics"— Presentation transcript:
1 Experiment #2 Resistor Statistics The object of this experiment is to generate a histogram demonstrating how many resistors in a sample of the same nominal value meet specifications.A histogram is a plot that shows how many of an item fall into specific “bins”.
2 ProcedureEach student will be given a sample of resistors having the same nominal value.For each resistor:Determine the nominal value from the color code.Measure and record the resistance of each resistor in the sample.Enter your data in an Excel table as shown on the next page.Plot a histogram bar graph of the measured values and determine the mean and the standard deviation of the resistance values.
3 Example Histogram Raw Data Table Generated by Excel Value110002105039904107559506899711028108091005101020Number of resistors with values < or = to 900BinFrequency900195010002105031100MoreNumber of resistors with values from 1051 through 1100Plot of Excel Table Data
4 Data for Experiment #2=Explain Allowable range, mean and standard deviation
5 Preparing to Plot a Histogram Before you start to generate a plot, create a sequence of 5 numbers in your Excel sheet, equally spaced, from the minimum of your allowable range to the maximum of your allowable range.For example, if the range was , I would generate the following sequence:400500600700800
6 Generating a Histogram Table Click on the “Data” pull-down menuSelect “Data Analysis”Select “Histogram”For Input RangeEnter the cell range with your resistance measurements (e.g. a4:a20)For Bin RangeEnter the cell range of your 5 valuesFor Output RangeEnter the cell that you want to be the upper left corner of your histogram table
7 Generating a Histogram Plot Select (click and drag the cursor over) the table that was created using the histogram commandClick on the “Insert” pull down menuSelect “Column”Select chart typeYou’ll see a preview of your plot, click “next”Enter a label for the x axis and change the plot title from “frequency” to something with your nominal resistor value in it, click “next”Select “as object in sheet 2” in last step then click “finish”
8 What needs to be turned in A printout of the data table including:The original dataThe histogram tableThe histogram plot