(a) The trend line can be considered to be as a linear trend line, in which case applying OLS to the data would be sufficient. We have the independent variable as t=1,2,...,12. The regression model would be as .
The slope coefficeint would be as or or , and or or .
Hence, the trend line would be as .
(b) We have t=18 for the June, 2020. We have the expected exchange rate as or .
2. The following table gives the average monthly exchange rate between the Omani rial (OMR) and...