Question

Many freeways have service (or logo) signs that give information on attractions, camping, lodging, food, and gas services prior to off-ramps. these signs typically do not provide information on distances. an article reported that in one investigation, six sites along interstate highways where service signs are posted were selected. for each site, crash data was obtained for a three-year period before distance information was added to the service signs and for a one-year period afterward. the number of crashes per year before and after the sign changes were as follows.

Answer 1

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