1. Paired Samples T-Test

Summarize the results;

a. Report the group N, mean, and standard deviations.

b. The t statistic.

c. The degrees of freedom.

d. The 2-tailed p value.

e. The Cohen's d effect size estimate.

Provide an interpretation of the results, which covers the following:

a. Why is a dependent samples test appropriate in this case? Why not use an independent samples test?

b. Identify the null hypothesis being tested.

c. Indicate whether the null hypothesis is rejected, and what this informs about the research objective

Paired Samples T-Test
Measure 1		Measure 2	t	df	p	Mean Difference	SE Difference	Cohen's d
Pre-intervention		-		Post-intervention		1.773		79		0.080		571.134		322.151		0.198
.

Descriptive

Descriptive
	N	Mean	SD	SE
Pre-intervention		80		5718.750		10625.498		1187.967
Post-intervention		80		5147.616		8262.744		923.803

2. INDEPENDENT SAMPLE T TESTS: PRE-INTERVENTION COMPARISON

DESCRIPTIVES

Summarize the results;

a. Report the group N, mean, and standard deviations.

b. The appropriate t statistic (i.e., equal or unequal variances, pick the appropriate one).

c. The degrees of freedom.

d. The 2-tailed p value. e. The Cohen's d effect size estimate.

Provide an interpretation of the results;

a. Identify the purpose of the test (i.e., why might it be insufficient to simply eyeball the two means?)

b. State the null hypothesis that is being tested.

c. Indicate whether the null hypothesis regarding differences between the target and non-target cities should be rejected, and what this informs about the research objective.

Group Descriptive
	Group	N	Mean	SD	SE
Violent rate		Non-Target		154		1255.185		1500.996		120.954
		Target City		80		5807.644		11092.647		1240.196

Independent Samples T-Test
	t	df	p	Cohen's d
Violent rate		-5.015		232		<.001		-0.691