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Two prestigious fine art schools are located in New England, Central and Northeast. Talented vocal students attend each school. At Central, voice students are required to take voice lessons twice each week and to practice their singing at least one hour each day. At Northeast, voice students are required to take voice lessons only once per week, and they are required to practice only three times each week. The voice students from both schools were recently tested on a variety of vocal techniques, including breath control. Voice students at Central were able to hold a single note for 60 seconds, which was 15 seconds longer than the Northeast voice students. Thus, one must conclude that Northeast voice students will improve their breath control only if they increase their voice lessons to twice per week and their practice to one hour each day.
The paragraph assumes which one of the following?