Table 3: The probability of a false rejection of the null hypothesis that the sample and the reference populations have equal means, according to the Single-Sample Sign test $S_{\rm {s}}$ , the t-test $S_{\rm {t}}$ and the Wilcoxon Rank Sum test $S_{\rm {W}}$ . The corresponding values of a, t and z are given in brackets.
minimum mid-decl maximum

daily $R_{\rm {g}}$ $10\pm12.3$ $55\pm34$ $115\pm 48$

$S_{\rm {s}}\ (a)$ 0.85 (0.18) 0.05 (-2) 0.03 (-2.3)

$S_{\rm {t}}\ (t)$ 0.16 (1.5) $0.0043\ (-3.4)$ $10^{-6}\ (-8.6)$

$S_{\rm {W}}\ (z)$ 0.28 (-0.58) $3\cdot 10^{-5}$ (4) 0 (5.7)

monthly $R_{\rm {g}}$ $10\pm8.3$ $55\pm27$ $115\pm 39$

$S_{\rm {t}}\ (t)$ 0.03 (2.6) 10^-10 (-14) 0.0 (-27)

$S_{\rm {W}}\ (z)$ 0.18 (0.88) 10^-5 (4.2) 0.0 (5.7)

**Table 3:** The probability of a false rejection of the null hypothesis that the sample and the reference populations have equal means, according to the Single-Sample Sign test $S_{\rm {s}}$ , the t-test $S_{\rm {t}}$ and the Wilcoxon Rank Sum test $S_{\rm {W}}$ . The corresponding values of a, t and z are given in brackets.
	minimum	mid-decl	maximum
daily $R_{\rm {g}}$	$10\pm12.3$	$55\pm34$	$115\pm 48$
$S_{\rm {s}}\ (a)$	0.85 (0.18)	0.05 (-2)	0.03 (-2.3)
$S_{\rm {t}}\ (t)$	0.16 (1.5)	$0.0043\ (-3.4)$	$10^{-6}\ (-8.6)$
$S_{\rm {W}}\ (z)$	0.28 (-0.58)	$3\cdot 10^{-5}$ (4)	0 (5.7)
monthly $R_{\rm {g}}$	$10\pm8.3$	$55\pm27$	$115\pm 39$
$S_{\rm {t}}\ (t)$	0.03 (2.6)	10^-10 (-14)	0.0 (-27)
$S_{\rm {W}}\ (z)$	0.18 (0.88)	10^-5 (4.2)	0.0 (5.7)

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