Problem: Background: Joseph Raymond McCarthy (November 14, 1908 - May 2, 1957) was an American politician who served as U.S. Senator from the state of Wisconsin from 1947 until his death in 1957. Beginning in 1950, McCarthy became the most visible public face of a period in the United States in which Cold War tensions fueled fears of widespread Communist subversion. He is known for alleging that numerous Communists and Soviet spies and sympathizers had infiltrated the United States federal government, universities, film industry, and elsewhere. Ultimately, the smear tactics that he used led him to be censured by the U.S. Senate.
Context: In 1942, shortly after the U.S. entered World War II, McCarthy joined the United States Marine Corps, despite the fact that his judicial office exempted him from military service. His college education qualified him for a direct commission, and he entered the Marines as a first lieutenant. McCarthy reportedly chose the Marines with the hope that being a veteran of this branch of the military would serve him best in his future political career. According to Morgan, writing in Reds, McCarthy's friend and campaign manager, attorney and judge Urban P. Van Susteren, had applied for active duty in the Army Air Force in early 1942, and advised McCarthy: "Be a hero--join the Marines." When McCarthy seemed hesitant, Van Susteren asked, "You got shit in your blood?" He served as an intelligence briefing officer for a dive bomber squadron in the Solomon Islands and Bougainville for 30 months (August 1942 - February 1945), and held the rank of captain by the time he resigned his commission in April 1945. He volunteered to fly twelve combat missions as a gunner-observer, acquiring (or perhaps giving himself) the nickname "Tail-Gunner Joe". McCarthy remained in the Marine Corps Reserve after the war, attaining the rank of major. He later falsely claimed participation in 32 aerial missions in order to qualify for a Distinguished Flying Cross and multiple awards of the Air Medal, which the Marine Corps chain of command decided to approve in 1952 because of his political influence. McCarthy also publicized a letter of commendation which he claimed had been signed by his commanding officer and Admiral Chester W. Nimitz, then Chief of Naval Operations. However, his commander revealed that McCarthy had written this letter himself, probably while preparing award citations and commendation letters as an additional duty, and that he signed his commander's name, after which Nimitz signed it in the process of signing numerous other such letters. A "war wound"--a badly broken leg--that McCarthy made the subject of varying stories involving airplane crashes or anti-aircraft fire had in fact happened aboard ship during a raucous celebration for sailors crossing the equator for the first time. Because of McCarthy's various lies about his military heroism, his "Tail-Gunner Joe" nickname was sarcastically used as a term of mockery by his critics. McCarthy campaigned for the Republican Senate nomination in Wisconsin while still on active duty in 1944 but was defeated by Alexander Wiley, the incumbent. After he left the Marines in April 1945, five months before the end of the Pacific war in September 1945, McCarthy was reelected unopposed to his circuit court position. He then began a much more systematic campaign for the 1946 Republican Senate primary nomination, with support from Thomas Coleman, the Republican Party's political boss in Wisconsin. In this race, he was challenging three-term senator Robert M. La Follette Jr., founder of the Wisconsin Progressive Party and son of the celebrated Wisconsin governor and senator Robert M. La Follette, Sr.
Question: When did McCarthy join the military?
Answer: In 1942, shortly after the U.S. entered World War II, McCarthy joined the United States Marine Corps,

Background: Raymond Bernard Cattell (20 March 1905 - 2 February 1998) was a British and American psychologist, known for his psychometric research into intrapersonal psychological structure. His work also explored the basic dimensions of personality and temperament, the range of cognitive abilities, the dynamic dimensions of motivation and emotion, the clinical dimensions of abnormal personality, patterns of group syntality and social behavior, applications of personality research to psychotherapy and learning theory, predictors of creativity and achievement, and many multivariate research methods including the refinement of factor analytic methods for exploring and measuring these domains. Cattell authored, co-authored, or edited almost 60 scholarly books, more than 500 research articles, and over 30 standardized psychometric tests, questionnaires, and rating scales. According to a widely cited ranking, Cattell was the 16th most eminent, 7th most cited in the scientific journal literature, and among the most productive, but controversial psychologists of the 20th century.
Context: Cattell noted that in the hard sciences such as chemistry, physics, astronomy, as well as in medical science, unsubstantiated theories were historically widespread until new instruments were developed to improve scientific observation and measurement. In the 1920s, Cattell worked with Charles Spearman who was developing the new statistical technique of factor analysis in his effort to understand the basic dimensions and structure of human abilities. Factor analysis became a powerful tool to help uncover the basic dimensions underlying a confusing array of surface variables within a particular domain. Factor analysis was built upon the earlier development of the correlation coefficient, which provides a numerical estimate of the degree to which variables are "co-related". For example, if "frequency of exercise" and "blood pressure level" were measured on a large group of people, then intercorrelating these two variables would provide a quantitative estimate of the degree to which "exercise" and "blood pressure" are directly related to each other. Factor analysis performs complex calculations on the correlation coefficients among the variables within a particular domain (such as cognitive ability or personality trait constructs) to determine the basic, unitary factors underlying the particular domain. While working at the University of London with Spearman exploring the number and nature of human abilities, Cattell postulated that factor analysis could be applied to other areas beyond the domain of abilities. In particular, Cattell was interested in exploring the basic taxonomic dimensions and structure of human personality. He believed that if exploratory factor analysis were applied to a wide range of measures of interpersonal functioning, the basic dimensions within the domain of social behavior could be identified. Thus, factor analysis could be used to discover the fundamental dimensions underlying the large number of surface behaviors, thereby facilitating more effective research. As noted above, Cattell made many important innovative contributions to factor analytic methodology, including the Scree Test to estimate the optimal number of factors to extract, the "Procrustes" oblique rotation strategy, the Coefficient of Profile Similarity, P-technique factor analysis, dR-technique factor analysis, the Taxonome program, as well the Rotoplot program for attaining maximum simple structure solutions. In addition, many eminent researchers received their grounding in factor analytic methodology under the guidance of Cattell, including Richard Gorsuch, an authority on exploratory factor analytic methods.
Question: What will it provide?
Answer:
then intercorrelating these two variables would provide a quantitative estimate of the degree to which "exercise" and "blood pressure" are directly related to each other.