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 09-03-07, 08:48 PM #1 MattP. Obeying Gravity Thread Starter   Join Date: Oct 2004 Location: Bellingham, WA Bikes: Posts: 2,962 Mentioned: 0 Post(s) Tagged: 0 Thread(s) Quoted: 0 Post(s) High school physics lab question Hey all, Working on a lab report for my physics lab and had a quick question. In the lab, you set up a motion detector, drop a ball, examine the velocity, acceleration, and what not. The question is: How precisely can the MD measure time? How precisely can it measure distance? WHen we recorded a value, the motion detector took it out to the thousandths place. WOuld that be the answer. "The MD is precise down to the thousandth of a second." I always thought that precision was how close a value was to other similar values... A little confused as what to put, any help is excellent!
09-03-07, 09:00 PM   #2
Cypress

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If time is the unit of measure for your accuracy, then yeah, "The MD is accurate to 1/thousandth of one second".
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09-03-07, 10:44 PM   #3
mcoine
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Quote:
 Originally Posted by MattP. I always thought that precision was how close a value was to other similar values...
You're correct. Accuracy and precision are two different things. Accuracy is how close to the true value you are. Precision has to do with repeatability. You would have to do a number of tests and run some sort of anova (analysis of variation) to determine the precision.