stacyrenee1
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Joined: Tue Dec 04, 2018 6:15 pm
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How Are Antibodies Used for Blood Typing - Graph

My daughter chose this topic for her science project this year. We ordered the kit and she did the experiment, discovering what type of blood each of the samples was. She was able to see how the antibodies were key to determining blood type. We are struggling with figuring out a graph to use to describe her findings.

The constants are the Anti reagents: A, B or Rh
The variables are the 4 different samples that were given

[Administrator note: project procedure: https://www.sciencebuddies.org/science- ... #procedure]

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Re: How Are Antibodies Used for Blood Typing - Graph

Hello StaceyRenee,
Welcome to Science Buddies! This sounds like a fun project! You could make a "bar" graph for each of the 4 samples. It might be easiest to first make a summary table, based on the the data table where you recorded your results (like Table 3 in the Procedures section).

The summary table would have one row for each of the 4 samples. Then for each row, make 4 columns. The columns should correspond to the columns in your original data table. Now, start with sample 1. Since this is a summary table, the numbers that you enter in first column (Anti-A) will be how many of the 3 trials that were Yes for the Anti-A. Likewise, the number you enter in for the first sample in the second column (Anti-B) will be how many of the 3 trials were Yes for Anti-B. The number you enter in the third column will be how many of the 3 trails were Yes for Anti-Rh. Then, in the fourth column, record the Blood type that you determined from Table 1 in the Background Section (we'll have to do something special if the Blood type results weren't the same for all 3 trials --- see below!)

Repeat this for each row, corresponding to the 4 samples.

Now, you can use this summary table to make a graph for each of the 4 samples. You can arrange the 4 graphs to sort of look like your summary table. The graph for each sample will have 4 columns like the summary table, but instead of showing a _number_ of trials for the number of trials that were Yes, you can draw a bar. The height of the bar will correspond to the number of trials that were Yes. You could use colored markers to show the height of the bar, and use a different color for each of the 4 samples. You can arrange the 4 graphs like your summary table, one "row" being the bar graph for each sample.

Now, what to do for the Blood Type column if the Blood type results weren't all the same for all 3 trials for one or more of your samples? You could show the Blood Type based on the highest result - that is, if your result was 0 or 1 out of 3, treat that as a zero. If your result was 2 or 3 out of 3, treat that as a 3!

Give this a try and let us know how this works out. If you have questions be sure to post again!