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Exercise

Specifying & hypothesizing

In Chapter 3, you ran a two sample proportion test on the proportion of late shipments across freight cost groups. Recall the hypotheses.

\(H_{0}\): \(late_{\text{expensive}} - late_{\text{reasonable}} = 0\)

\(H_{A}\): \(late_{\text{expensive}} - late_{\text{reasonable}} > 0\)

Let's compare that traditional approach using prop_test() with a simulation-based infer pipeline.

late_shipments is available; dplyr and infer are loaded.

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Question

Run the proportion test code (previously seen in Chapter 3). Assuming a significance level of alpha = 0.05, what does the evidence suggest?

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