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. ; . 16 External links Unlike many other central banks such as Federal Reserve System or Bank of England MAS does not regulate the monetary system via interest rates to influence the liquidity in the system Instead it chooses to do it via the foreign exchange mechanism It does so by intervening in the SGD market. Singapore as a "Global Schoolhouse" All PISA results are tabulated by country; recent PISA cycles have separate provincial or regional results for some countries Most public attention concentrates on just one outcome: the mean scores of countries and their rankings of countries against one another In the official reports however country-by-country rankings are given not as simple league tables but as cross tables indicating for each pair of countries whether or not mean score differences are statistically significant (unlikely to be due to random fluctuations in student sampling or in item functioning) In favorable cases a difference of 9 points is sufficient to be considered significant.[citation needed]. ! .

. Much of the content of the Tetrabiblos was collected from earlier sources; Ptolemy's achievement was to order his material in a systematic way showing how the subject could in his view be rationalized It is indeed presented as the second part of the study of astronomy of which the Almagest was the first concerned with the influences of the celestial bodies in the sublunary sphere Thus explanations of a sort are provided for the astrological effects of the planets based upon their combined effects of heating cooling moistening and drying. . . Global cooling over the past 40 million years driven by the expansion of grass-grazer ecosystems. P = i - r The IB Career-related Programme (formerly IB Career-related Certificate) was first offered in 2012.