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# Chi square test for association

The newspaper has charged that your police department responds more slowly to 911 calls in poor neighborhoods than in more wealthy ones. As Captain, you gather the following data [n = 191] to determine whether the allegation is true. Specify the null and alternative hypothesis.

Police Response Time
Neighborhood Less than 3 minutes 3 to 7 minutes Over 7 minutes
socio-economic
status

Low 11 17 35
Medium 16 24 13
High 48 20 7
Total 75 61 55

What do you conclude? [use alpha of 1%]

#### Solution Preview

Hypothesis
The newspaper has charged that your police department responds more slowly to 911 calls in poor neighbourhoods than in more wealthy ones. As Captain, you gather the following data [n = 191] to determine whether the allegation is true. Specify the null and alternative hypothesis.

Police Response Time
Neighbourhood Less than 3 minutes 3 to 7 minutes Over 7 minutes
socio-economic
status

Low 11 17 35
Medium 16 24 13
High 48 20 7
Total ...

#### Solution Summary

The solution provides step-by-step method for the calculation of chi square test for association. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

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