diff --git a/__pycache__/t_tests.cpython-314.pyc b/__pycache__/t_tests.cpython-314.pyc
new file mode 100644
index 0000000..9b75777
Binary files /dev/null and b/__pycache__/t_tests.cpython-314.pyc differ
diff --git a/get_statistics.py b/get_statistics.py
index 599da5e..3122377 100644
--- a/get_statistics.py
+++ b/get_statistics.py
@@ -6,7 +6,7 @@ file = "./data/pnad_trimestral_trimestre_012026.parquet"
 regions_ufs = {
     "Sul": [41, 42, 43],
     "Sudeste": [31, 32, 33, 35],
-    "Centro-Oeste": [50, 51, 52, 53],
+    "CentroOeste": [50, 51, 52, 53],
     "Norte": [11, 12, 13, 14, 15, 16, 17],
     "Nordeste": [21, 22, 23, 24, 25, 26, 27, 28, 29],
 }
diff --git a/t-tests.py b/t-tests.py
deleted file mode 100644
index 6f2e10e..0000000
--- a/t-tests.py
+++ /dev/null
@@ -1,54 +0,0 @@
-from get_statistics import get_regions, regions_names
-import math
-
-regions = get_regions()
-
-
-def t(n1, mean1, std1, n2, mean2, std2):
-    return (mean1 - mean2) / math.sqrt(
-        (math.pow(std1, 2) / n1) + (math.pow(std2, 2) / n2)
-    )
-
-
-def run_all_t_tests():
-    tests = {}
-    for name1 in regions_names:
-        for name2 in regions_names:
-            if name1 != name2:
-                tests[f"{name1}_formais_{name2}_informais"] = t(
-                    regions[name1]["formal_count"],
-                    regions[name1]["formal_mean"],
-                    regions[name1]["formal_std"],
-                    regions[name2]["informal_count"],
-                    regions[name2]["informal_mean"],
-                    regions[name2]["informal_std"],
-                )
-                tests[f"{name1}_informais_{name2}_informais"] = t(
-                    regions[name1]["informal_count"],
-                    regions[name1]["informal_mean"],
-                    regions[name1]["informal_std"],
-                    regions[name2]["informal_count"],
-                    regions[name2]["informal_mean"],
-                    regions[name2]["informal_std"],
-                )
-                tests[f"{name1}_informais_{name2}_formais"] = t(
-                    regions[name1]["informal_count"],
-                    regions[name1]["informal_mean"],
-                    regions[name1]["informal_std"],
-                    regions[name2]["formal_count"],
-                    regions[name2]["formal_mean"],
-                    regions[name2]["formal_std"],
-                )
-                tests[f"{name1}_formais_{name2}_formais"] = t(
-                    regions[name1]["formal_count"],
-                    regions[name1]["formal_mean"],
-                    regions[name1]["formal_std"],
-                    regions[name2]["formal_count"],
-                    regions[name2]["formal_mean"],
-                    regions[name2]["formal_std"],
-                )
-
-    return tests
-
-
-print(run_all_t_tests())
diff --git a/t_tests.py b/t_tests.py
new file mode 100644
index 0000000..645fc10
--- /dev/null
+++ b/t_tests.py
@@ -0,0 +1,57 @@
+from get_statistics import get_regions, regions_names
+import math
+
+regions = get_regions()
+
+
+def t(n1, mean1, std1, n2, mean2, std2):
+    return (mean1 - mean2) / math.sqrt(
+        (math.pow(std1, 2) / n1) + (math.pow(std2, 2) / n2)
+    )
+
+
+def run_all_t_tests():
+    tests = {}
+    for name1 in regions_names:
+        for name2 in regions_names:
+            region1 = regions[name1]
+            region2 = regions[name2]
+            if name1 != name2:
+                tests[f"{name1}_informal_{name2}_informal"] = t(
+                    region1["informal_count"],
+                    region1["informal_mean"],
+                    region1["informal_std"],
+                    region2["informal_count"],
+                    region2["informal_mean"],
+                    region2["informal_std"],
+                )
+                tests[f"{name1}_formal_{name2}_formal"] = t(
+                    region1["formal_count"],
+                    region1["formal_mean"],
+                    region1["formal_std"],
+                    region2["formal_count"],
+                    region2["formal_mean"],
+                    region2["formal_std"],
+                )
+            tests[f"{name1}_formal_{name2}_informal"] = t(
+                region1["formal_count"],
+                region1["formal_mean"],
+                region1["formal_std"],
+                region2["informal_count"],
+                region2["informal_mean"],
+                region2["informal_std"],
+            )
+            tests[f"{name1}_informal_{name2}_formal"] = t(
+                region1["informal_count"],
+                region1["informal_mean"],
+                region1["informal_std"],
+                region2["formal_count"],
+                region2["formal_mean"],
+                region2["formal_std"],
+            )
+
+    return tests
+
+
+if __name__ == "__main__":
+    print(run_all_t_tests())