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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 Spring '10
 RobertFarris
 Paul Gonzales, Paul Gonzales Pag757, Gonzales Pag757 BIO206L, Pag757 BIO206L Session

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