What is the difference between primary and secondary data? Primary data are data that you collect yourself; secondary data are data that others collect.
Primary data are data that other people collect; secondary data are data you collect yourself.
* Primary data are data that cannot be used for research; secondary data are data you can use for research.
O Primary data are data that you can use for research; secondary data are data that cannot be used for research.

Armed with invisible ink, a cipher system, and a passion to end the war and preserve the union, elizabeth van lew became butler's eyes and ears in the confederate capital city. truth be told, however, she became much more than that. she became a spymaster, the person responsible for running a network of agents, couriers, and safe houses that was very active during the war. in addition to the spying, elizabeth van lew continued to maintain her church hill home as a safe house and something of a local union spy headquarters. —the dark game, paul janeczko what is the central idea of this passage? van lew’s home was used as a safe house, which was critical to the confederacy. van lew had a passion to end the war and preserve the union. van lew was a spymaster, a leading force in the espionage activities for the union. van lew did not enjoy working for general butler.