why should I decide by 2 for z score?? I got 3.77 for z score but it seems divid

Question

why should I decide by 2 for z score??
I got 3.77 for z score but it seems divided half..

pole--re., :.STI -.3? +,33 14) A researcher believes that children who attend elementary school in a rural setting have lower obesity rates then children who attend elementary school in an urban setting. The researcher collects a random sample from each population and finds 14 of 95 rural children to be obese compared to 26 out of 100 urban children being obese. Test the researchers hypothesis using a 5% significance level. 2.215 A 26 Rejpot to F.21

Explanation / Answer

The adjustment is done because we want to perform one tailed test ie. whether the obesity in urvab areas is more or not. And the critical value that is calculated (3.77) is for 2 tailed test so this need to be changed! The other way of doing is to adjust p- value.

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