Refer to Data Table B, in which you entered rate constants. In the spaces below,
enter your rate constants,
highest to lowest
. Do not include units.
Rate Constants, in M
1
s
1
1.1e5
6.3e6
5.9e6
3.2e6
3.2e6
a. What is the range of these values (highest  lowest)?
7.8e6
b. What is the average of these values?
5.9e6
The remainer of this question is designed to help you decide if the data from one of your
experiments can be discarded.
To quantitatively "throw out" a measurement, you must perform a statistical test on your data
called a
QTest
. The formula for the Qtest is
Q
calculated
= gap/range
where gap = (questionable value  next closest number) and range = (largest number  smallest
number).
Q
calculated
is then compared to Q
table
. If Q
calculated
> Q
table
then the questionable datum can be
discarded.
Q (90% confidnece)
Number of measurements
0.76
4
0.64
5
0.56
6
c. What is the gap of these values (questionable value  next closest value)? (Take the absolute
value if necessary to make this number positive.)
4.7e6
d. What is Q
calculated
for your data above?
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 Spring '09
 FEDUCIA
 Chemistry, Qtable

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