A group of students calibrated a power supply using a voltmeter the same way you

Question

A group of students calibrated a power supply using a voltmeter the same way you did in class. They obtained the following results:
Output Voltage (V) Measured Voltage (V)
0.2 0.214
0.5 0.520
1.0 1.01
1.4 1.38
1.9 1.89
2.4 2.41
2.9 2.90
(a) Analyze the data. (You will not submit this spreadsheet. However, the results will be needed later in this problem.)
(i) Enter the above data into an Excel spreadsheet.
(ii) Make a plot of output voltage versus measured voltage.
(iii) Use the LINEST function to fit the data of output voltage versus measured voltage to get the slope and its uncertainty.

(b) Report your results below. (Enter slope to four significant figures.)

slope = .9940 Your answer is incorrect. ± .005832 Your answer is incorrect.


I graphed the numbers using Excell and the numbers it gave me for slope didn't work. Is there another way I should be doing this?

Explanation / Answer

The numbers you get match what I got--your method is correct. I would say that error lies in the number of digits you are reporting on the error. Technically, the correct answer would be 0.994±0.006, since you shouldn't be reporting more precision on your slope than the error allows. However, since it asks for four sigfigs on the slope, I would say it either wants 0.9940±0.006 or 0.9940±0.0058.

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