It created many aircraft for the United States Air Force, and also the many of the "DC" line aircraft (DC-1[?], for example).
In 1967, the company was merged with McDonnell Aircraft Company[?] to form McDonnell Douglas, which in 1997 became a part of the Boeing Company.
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... several values of X and Y have been measured, then the Pearson product-moment correlation coefficient can be used to estimate the correlation of X and Y.
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