ࡱ> FHE bjbj,, (6NN  \z2MMMMM(((N!((((,zMM4zzz0.MMz(zz:id^  J0zR!z!izi}((( :   UNCERTAINTY LAB Name _________________________ Todays work will go at the end of your Biology Survival Guide. You will be measuring and recording, with uncertainty, the items below. List the tool, what is being measured, and the measurement with units and uncertainty. Also make notes about how you determined the uncertainty for reference at a later time. ToolWhat measuredMeasurement with UncertaintyNotes1a. 1b. 2. 3. 4a. 4b. 5. 6.  Before you begin, a few words about uncertainty. We make a lot of measurements in science. When taking a measurement there is always a sense of accuracy that is plus or minus some value. That value is called uncertainty. For instance, a distance might be reported as 14.5 m +/- .2 m. That means that the actual distance is between 14.3 m and 14.7 m. The unit for the measurement and the uncertainty should match. The uncertainty is determined by the tool we use and how well we use it. There is always a minimum uncertainty for a tool, but your uncertainty could be larger if you think you used it poorly. In general, the uncertainty is the smallest increment on the tool. For instance, a graduated cylinder that increases by 1 mL has an uncertainty of +/- .5 mL. Every time you use the tool, you add the uncertainty to get a total uncertainty for that single measurement. When using a ruler, you must estimate the start and end of the object placement, so the uncertainty at each end must be added together. Electronic balances have an uncertainty of the smallest increment (do not halve it). Other electronic tools, like probes and sensors, come with their own specifications. The manufacturer has determined the uncertainty for the tool and states it as accuracy in the manual. Stopwatches have a standard uncertainty of +/-.3 seconds. This takes into account peoples reaction times. When we count in Biology (called a discrete count), we count multiple times (trials either by the same person or different). Next we find the average of those trials for the measurement. The uncertainty is half the range of the trials. For instance, someone counts 100, 125, and 150 objects. The average is 125 and the uncertainty is (150-100)(2=25. There are 125 objects +/- 25. Now use what you have learned to do the following and fill in the data chart: The mass of the film canister using both electronic scales. The width of your notebook using a ruler. The temperature of the water that comes out of the cold water tap. The volume of water that fits in the plastic bottle and the thimble (separately). The time it takes you to count backwards from 20 by fours. 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