Exercise

Pairwise t-tests

The ANOVA test didn't tell us which categories of shipment mode had significant differences in pack prices. To pinpoint which categories had differences, we could instead use pairwise t-tests.

late_shipments is available.

Instructions 1/3

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Perform pairwise t-tests on late_shipments's pack_price variable, grouped by shipment_mode. Don't do any p-value adjustment, and keep the default "two.sided" alternative hypothesis specification.