2. Amendments.txt is a tab delimited le containing information on the 27 amendments to the US con-

stitution. The included variables are Amendment (the amendment number), Proposed (the date the

amendment was proposed), and Completed (the date the amendment was ratied). Note the format

of the dates. Load this le into R as a data frame. Make each of the following alterations to this data

frame:

• Alter the Proposed and Completed variables so that they are stored as date data.
• Make a new variable called Elapsed that is the dierence between the proposal and ratication

dates of the amendments, in days.

• Make a new variable called Swift. Swift should be assigned a value of 'Yes' if Elapsed is less

than or equal to 365 days, whereas it should be assigned a value of 'No' if Elapsed is greater than 365 days.

Print the resulting data frame and report your output.

Amendment Proposed Completed

1st September 25, 1789 December 15, 1791

2nd September 25, 1780 December 15, 1791

3rd September 25, 1789 December 15, 1791

4th September 25, 1789 December 15, 1791

5th September 25, 1789 December 15, 1791

6th September 25, 1789 December 15, 1791

7th September 25, 1789 December 15, 1791

8th September 25, 1789 December 15, 1791

9th September 25, 1789 December 15, 1791

10th September 25, 1789 December 15, 1791

11th March 4, 1794 February 7, 1795

12th December 9, 1803 June 15, 1804

13th January 31, 1865 December 6, 1865

14th June 13, 1866 July 9, 1868

15th February 26, 1869 February 3, 1870

16th July 12, 1909 February 3, 1913

17th May 13, 1912 April 8, 1913

18th December 18, 1917 January 16, 1919

19th June 4, 1919 August 18, 1920

20th March 2, 1932 January 23, 1933

21st February 20, 1933 December 5, 1933

22nd March 21, 1947 February 27, 1951

23rd June 16, 1960 March 29, 1961

24th September 14, 1962 January 23, 1964

25th July 6, 1965 February 10, 1967

26th March 23, 1971 July 1, 1971

27th September 25, 1789 May 5, 1992