You are working on a project to determine whether community crime prevention efforts are effective at reducing crime level. You collected data on the number of crimes for a sample of 9 gated communities that implemented the crime prevention efforts (experimental group) and 9 gated communities that did not receive the crime prevention efforts (control group). The results are presented in the table below. Your hypothesis is that the experimental group has a lower mean number of crimes than the control group (i.e., community crime prevention measures are effective).

Q: Calculate the test statistic/obtained value.

• Round intermediate steps to 5 decimal places if necessary.
• Round your final answer to 2 decimal places.
• Type the value only; do not include the negative sign (-).

	Experimental Group	Control Group
	8	16
	7	17
	10	14
	11	12
	14	14
	11	16
	10	19
	17	12
	11	15
Mean:	11	15
Standard Deviation:	3	2

Type your answer below. *Type the value only; do not include the negative sign (-).

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