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# Lab1 - J Paul Gonzales Pag757 BIO206L Session#49540 1 Mean...

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January 24, 2010 Paul Gonzales Pag757 BIO206L Session #49540 1) Mean – the average or center of a set of data. You can predict future results as to where values may end up in a cluster of values. Standard Deviation – a measure of the spread of data in relation to the center. It can tell you how far away a point is from the average of the data. Percent of the Mean – a percentage of how far off a value is from the normal or accepted value, will tell you what percent “off” your calculation was from the normal or accepted value of the data. 2) % error of mean (graduated cylinder) = -4.31% % error of mean (Erlenmeyer flask) = -14.37 % % error of mean (beaker) = -18.42 % The graduated cylinder appears to be the most accurate device for measuring a 60 mL volume. This device is more accurate because it has hash marks that make it a lot easier to recognize specificity in any volume you are trying to acquire. In section 1.3 you cannot tell which device is more precise, because we only took one measurement for each device. Had we taken more measurements, then we could measure precision. 3) Mean: 58.12 mL Standard Dev: .3818376618 Percent error of the mean: -3.13 % error 4) Mean: 58.77 mL Standard Dev: .6182090484 Percent error of the mean: -2.05% 5) The class data presents a much higher mean than our group data, probably due to the different styles or techniques of people measuring each volume. The standard deviation, or average distance of points away from the expected value is much larger than our group data. This is in accordance with the mean of the data, so again, it has to deal with the differences in measuring of the volumes. Because each group had a different person measuring the volume, it accounts for some difference in mean and standard deviation. Also, the percent error of the class data is much less than our group data, which implies a larger sample size was used. The class data also has a mean closer to the expected target value because it

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Lab1 - J Paul Gonzales Pag757 BIO206L Session#49540 1 Mean...

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