A student wants to estimate the proportion of times a spun penny will land on heads. She spins a penny 50 times and records the number of times it lands on heads. What is the appropriate inference procedure?

The student is estimating a proportion: the fraction of spins that land on heads. Since she recorded results from one sample of 50 spins and wants an estimate rather than testing a claim, the appropriate procedure is a one-sample z-interval for p. A t-procedure is used to estimate or test a population mean, not a proportion.

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