In an experiment to determine the number of vacuum cleaners sold by a door-to-door salesman, which factor is the dependent variable?
A. Convincing power of the salesman
B. Number of vacuum cleaners sold
C. Price of vacuum cleaners
D. Quality of vacuum cleaners
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It began after the stock market crash of October 1929, which sent Wall Street into a panic and wiped out millions of investors. Over the next several years, consumer spending and investment dropped, causing steep declines in industrial output and employment as failing companies laid off workers
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