In astudy, 120

120 rental properties that had already been the target of drug law enforcement were randomly divided into two groups. In the experimentalgroup, the tenants received a letter from the police describing the enforcement tactics in place. For the controlgroup, there was no letter. The table gives summary statistics for the number of crimes reported over a30-month interval. Determine whether the letter from the police was effective in reducing the number of crimes at the 0.05

0.05 level. Although the distribution of number of crimes is notNormal, assume that the sample size is large enough for the Central Limit Theorem to apply.

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