1.
a. Our data shows the 125-mL Erlenmeyer flask as having the lowest Percent
Error of Mean (0.45%), meaning that this should be the most accurate measuring
device. This is false in most cases, though, because the 100-mL graduated
cylinder should be the most accurate device because it is more calibrated, in other
words, it has more measuring ticks.
b. From the data collected in Section 1.3, one cannot easily determine the
precision because measurements were only taken three times, and precision is the
consistency a number is reproduced. We would need to do more trials and
calculate the standard deviation of the mean to determine the precision. The
smallest number calculated from the standard deviation would be the most
precise.
2. a.
•
The class data has a mean closer to the target value of 9-mL. Our group mean was
8.48-mL and the class data was 8.68-mL.
•
The percent error of the mean indicates accuracy.
•
The class data is more accurate because its percent of the mean is 0.04% and our
group was 0.06%. The smaller percentage indicates that it deviates less from the
target value.
•

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