Table 2 Statistical significance of differences in the mean carbon isotopic compositions of mammals between different regions as determined by two-tailed t-tests.

From: Savanna ecosystems and mammalian adaptations in Mid-Miocene Northern China

Sample

Mean difference (%)

t

p

Significant difference at 95% CI?

Junggar δ13C vs. Tongxin δ13C

1.07

6.12

5.4591E-09

Yes

Junggar δ13C vs. Germany δ13C

2.17

12.65

7.768E-27

Yes

Junggar δ13C vs. Madrid δ13C

0.55

2.44

0.0164

Yes

Tongxin δ13C vs. Germany δ13C

1.10

7.04

3.8527E-11

Yes

Tongxin δ13C vs. Madrid δ13C

0.52

2.62

0.0098

Yes

Germany δ13C vs. Madrid δ13C

1.61

8.42

6.153E-14

Yes

Junggar δ13C vs. Oregon δ13C

1.58

10.96

4.7565E-24

Yes

Tongxin δ13C vs. Oregon δ13C

0.52

3.72

0.0002

Yes

Germany δ13C vs. Oregon δ13C

0.58

4.25

2.8408E-05

Yes

Madrid δ13C vs. Oregon δ13C

1.03

5.30

2.404E-07

Yes

Nebraska δ13C vs. Oregon δ13C

1.18

10.48

5.5657E-23

Yes

Junggar δ13C vs. Nebraska δ13C

0.40

2.64

0.0088

Yes

Tongxin δ13C vs. Nebraska δ13C

0.67

4.61

6.2455E-06

Yes

Germany δ13C vs. Nebraska δ13C

1.77

12.41

2.3891E-28

Yes

Madrid δ13C vs. Nebraska δ13C

0.15

0.77

0.44

No

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