In ? = 48 independent trials believed to be representative of trials at a particular lab- oratory, 16 resulted in ignition of a particular type of substrate by a lighted cigarette. Find a 95% CI for the true proportion, ?. You will need to state the parameter of interest, check conditions, calculate the CI, report the CI in context, and interpret the CI.

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Q: a) Find t. (Give your answer correct to two decimal places.)

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