Table 4. Statistical analysis of the annual mean temperature in Basel and the number of days since the beginning of Poaceae pollen release.

	Variable 1	Variable 2
Mean	131.58	10.338
Variance	53.06489796	0.759546939
Observations	50	50
Pearson correlation	–0.493121532
Hypothesized mean difference	0
Degrees of freedom	49
t stat	110.5992921
P (T<=t) one-tail	9.50237E-61
t Critical one-tail	1.676550893
P (T<=t) two-tail	1.90047E-60
t critical two-tail	2.009575237

t-test: paired two sample for means.