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A sample of 20 students who had recently taken elementary statistics yielded the following information on brand of calculator owned. (T = Texas Instruments, H

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A sample of 20 students who had recently taken elementary statistics yielded the following information on brand of calculator owned. (T = Texas Instruments, H = Hewlett Packard, C = Casio, S = Sharp): HTTTCSCTTC HHTSHTCHHS (a) Estimate the true proportion of all such students who own a Texas Instruments calculator. :1 (b) Of the 7 students who owned a TI calculator, 6 had graphing calculators. Estimate the proportion of students who do not own a TI graphing calculator. [:J

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