Lab Report: Results Section

Your results section should include a short narrative section;
a figure illustrating the rate of change for each
treatment (experimental & control) represented by
average root length (mm) per day
; and a table comparing the
average day of germination, mean rate
of growth (mm/day), and mean final root length (mm) for each treatment.
Please make sure your table and figure include details regarding the
complete scientific name of the allelopathic
plant you investigated, the part of the plant used in your experiment, your con
trol set up, the number of
Brassica
rapa
seeds in e
ach treatment group, and the duration of the experiment. The tables and figures are be placed after
the narrative section.
A few things regarding the narrative section:

Use
the text component
to gu
ide the reader through your key results, i.e., those results which answer the
question(s) you investigated. Each Table and Figure must be referenced in the text portion of the
results,
and y
ou must tell the reader what
key result(s)
and trends
each Table
or Figure
conveys
(
without simply
regurgitating the data
).

Consider the differences, directionality, and magnitude of the data
. Provide information that explains
the nature of differences or relationships between the treatment and control groups.
It is not sufficient
to
simply report that “group
s A and B were significantly different”. How are they different? How much are
they different? It is much more informative to say something like, “Seedling grown not in the presence of
Artemisia tridentate
leaves were 23% longer on average than those with t
he leaves”, or, “The
Brassica rapa
seedlings in the presence of
Artemisia tridentate
leaves germinated on average one day later than those
grown in the absence of the
A. tridentate
leaves.”

Include your standard deviation measurements in your descriptions of the data as instructed in the video
“Allelopathy II and t
-test” in Week 8’s module. This involves stating the mean of some measured variable
and using parenthetical citation (X= , SD=). For example: “Guinea pigs that were fed T
-bone steaks were
taller (
mean height = 19.6” +/
– 0.63”) than those fed g-
fud (mean height = 17.1” +/
– 1.54”).”

When comparing groups, avoid referring to groups as “control” and “experimental group”. State
the
conditions of the
treatments.

Address your results in the context of the
null hypothesis. Specifically, state whether you fail to reject
OR reject the null hypothesis. State what the null hypot
hesis
or your (alternate) hypothesis
is (briefly),
so
it is clear what you are rejecting or failing to
reject.

The Student’s
t-test was based on the root lengths (mm) at day 7
(i.e. the final root lengths
). The test was
to determine if differences between plant seedling growth were due to random chance or if the differences
reflected a biologically
-mediated inhibition of
growth.

If your t
-test was significant, then the results support a rejection of the null. This suggests that
the growth patterns were due to the introduced variable in your experimental set up (here that is
the presence of allelopathic
chemicals).

If your t
-test was not significant, then the results do support a rejection of the null (ie: a failure to
reject the null). This suggests that the growth patterns were due to a natural variation within your
experiment or to some source of error (in other words you have no statistical claim that any
differences in the mean values of root growth were due to the presence of
allelochemicals).

When you write that your results were significant or not significant you want to then put your
supporting
statistics from the t
-test after your statement using parenthesis. It should look something like
this:
“The presence of
Artemisia tridentate
leaves had a significant negative affect on the root growth of
Brassica
rapa
seedlings and support a rej
ection of our null hypothesis
(t-test: t=
, df =
, p
0.05).”
Remember you want to write in if your p-
value (shown as the alpha value on the t
-test chart) is less than or greater
than 0.05.

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