Blood Type and Personality Survey Study
Helped design and analyze a 101-response survey testing whether blood type was statistically associated with four MBTI dimensions.
Period · Fall 2023
Role · Team project · survey design, cleaning, analysis, and visualization
Quick read
The through-line of the work.
Open
The starting question
Rather than simply believing or dismissing a claim you hear all the time, I wanted to check it with a small survey study.
Build
What I checked
A 28-question survey collected 101 responses, and I examined the relationship between the four MBTI dimensions and blood type with cross-tabulations and chi-square tests.
Turn
What changed my view
Most dimensions showed no significant relationship, and I judged that one dimension's result alone could not support a large conclusion.
Close
Where I draw the line
The sample is narrow and centred on people I know, so I kept the conclusion within what the data can say.
01 · Start
The question I began with
Does a familiar social belief about blood type and personality remain supported when translated into hypotheses and tested with survey data?
02 · Material
The data and evidence
03 · Work
How I worked through it
- 01
Design the research
Helped create demographic, blood-type, MBTI-related, and attention-check questions.
- 02
Prepare the responses
Cleaned and organized 101 responses for cross-tabulation.
- 03
Test independence
Calculated observed and expected frequencies and applied chi-square independence tests.
- 04
Limit the conclusion
Interpreted results against the sample's age concentration, acquaintance recruitment, and measurement constraints.
04 · Takeaway
What the numbers suggested
Three MBTI dimensions did not show a statistically significant association with blood type.
One isolated result exceeded the reported threshold.
The isolated result does not establish a broad scientific relationship.
Not claimed
- Does not claim blood type relates to personality. Three of four dimensions showed no significant association.
- Does not claim a generalizable conclusion. The sample skews toward people in their twenties.
05 · Use
Where this helps
The study demonstrates how to turn a popular claim into testable hypotheses and restrict the conclusion to what the evidence supports.
06 · Boundary
What still needs checking
- •The sample was concentrated among respondents in their twenties and recruited through team acquaintances.
- •Team size and task division still require confirmation.
- •Exact p-values and expected-frequency assumptions should be checked and reported.
07 · Figures
Tables and figures
Workbook chi-square summary
Verified source| MBTI dimension | χ² | Minimum expected |
|---|---|---|
| E / I | 2.6659 | 4.356 |
| T / F | 8.1474 | 4.950 |
| N / S | 1.5754 | 4.752 |
| P / J | 3.2498 | 4.158 |
The table reports the workbook's four chi-square statistics and minimum expected frequencies. Each test contains one expected cell below five, and one isolated result cannot establish a broad scientific relationship.
Source · Blood Type and Personality Survey workbook · 101 responses
T/F observed and expected frequencies
Verified source| Blood type | T · observed | T · expected | F · observed | F · expected |
|---|---|---|---|---|
| A | 12 | 18.178 | 24 | 17.822 |
| B | 16 | 14.644 | 13 | 14.356 |
| O | 18 | 13.129 | 8 | 12.871 |
| AB | 5 | 5.050 | 5 | 4.950 |
The table reproduces T/F observed counts and independence-based expected counts by blood type. The AB–F expected count is 4.950, below five, and the table does not support a generalized blood-type/personality claim.
Source · Blood Type and Personality Survey workbook · T/F table