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According to​ researchers, the mean length of imprisonment for​ motor-vehicle-theft offenders in a nation is 17.3...

According to​ researchers, the mean length of imprisonment for​ motor-vehicle-theft offenders in a nation is 17.3 months. One hundred randomly selected​ motor-vehicle-theft offenders in a city in the nation had a mean length of imprisonment of 18.2 months. At the 11​% significance​ level, do the data provide sufficient evidence to conclude that the mean length of imprisonment for​ motor-vehicle-theft offenders in the city differs from the national​ mean? Assume that the population standard deviation of the lengths of imprisonment for​ motor-vehicle-theft offenders in the city is 4.0 months.

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