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Mathematics, 30.10.2021 14:00 4Tris

State DMV records indicate that of all vehicles undergoing emissions testing during the previous year, 70% passed on the first try. A random sam- ple of 200 cars tested in a particular county during the current year yields 124 that passed on the initial test. Does this suggest that the true propor- tion for this county during the current year differs from the previous statewide proportion? Test the relevant hypotheses using a 1⁄4 .05.

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