I constructed a two-way table of exchange rates for US dollars on different currencies from 2018 June to October.
| Month | ||||||
| June | July | August | September | October | ||
| Exchange Rate
|
EUR | 0.851 | 0.855 | 0.860 | 0.863 | 0.867 |
| GBP | 0.746 | 0.756 | 0.778 | 0.775 | 0.767 | |
| CAD | 1.294 | 1.313 | 1.307 | 1.299 | 1.288 | |
| AUD | 1.312 | 1.351 | 1.357 | 1.400 | 1.401 | |
| IEP | 0.670 | 0.673 | 0.684 | 0.680 | 0.683 | |
Graph 1: The mean of each currency among these months.
Graph 2: The exchange rate grouped by currencies.
Graph 3: The exchange rate for each currency grouped by months.
It’s shown by the first graph that one US dollar is worth the most amount of Australian dollars, then Canadian dollars and the least amount of Irish pounds. If we look at the trend over these months in graph 2, we could find that the exchange rate of Euros and the Irish pounds to US dollars are relatively stable whereas there is a large spread in Australian dollars. And the grids on graph 3 help us better illustrate the exact amount of change and the change rate.
Overall, the graph 2 which is the exchange rate grouped by currency that are most efficient since overall the exchange rates does not change too much throughout these months but group 2 also show the differences between different currencies clearly as well.