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): H S ST SCH HTH ST THH CS S C C (a) Estimate the true proportion of all such students who own a Texas Instruments calculator. 25 (b) Of the 4 students who owned a TI calculator, 2 had graphing calculators. Estimate the proportion of students who do not own a TI graphing calculator.

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Q: Interpret the 95% CI.b. What assumption is needed for this CI to be valid?

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