Question

Stem diameter (mm)
W1	W2	W3	W4	W5	W6	W7
3.1	4.5	5.7	6.8	7.9	8.5	8.6
3.1	4.9	6.9	8.2	9.2	9.8	10.1
3.1	4.1	5.5	6.7	7.6	7.9	8.0
3.2	4.3	5.5	7.0	8.2	8.8	8.9
Table 2 shows the class average for stem diameter by week

using this data set, i created a line graph that was recommended from the instructor. When writing a discussion for a scientific paper, i need to discuss statistical comparison. I can't figure out how I would create error bars for each treatment type, or are error bars not the correct thing to use?

Answer 1

Anova: Single Factor
SUMMARY
Groups	Count	Sum	Average	Variance
W1	4	12.5	3.125	0.0025
W2	4	17.8	4.45	0.116667
W3	4	23.6	5.9	0.453333
W4	4	28.7	7.175	0.4825
W5	4	32.9	8.225	0.4825
W6	4	35	8.75	0.63
W7	4	35.6	8.9	0.78

ANOVA
Source of Variation	SS	df	MS	F	P-value	F crit
Between Groups	120.2271	6	20.03786	47.58779	0.00000	2.572712
Within Groups	8.8425	21	0.421071
Total	129.0696	27

As you can see statistically they are significant as p value < 0.05

Please revert back in case of any doubt.

Please upvote. Thanks in advance.