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One sample tests for means

Quick reaction times are essential to playing many video games. Pranav has come up with a reflex-training program that he believes will improve players' reaction times. To test the effectiveness of his program, Pranav selects a random sample 55 of his gamer friends for an experiment. The experiment consists of having the subjects perform a reflex-task and recording their response times both before and after completing the training program.
The before-and-after reflex times in milliseconds are shown below:
Subject1122334455
Before227227217217180180187187204204
After215215196196179179177177189189
Pranav intends to use this data to conduct a hypothesis test to gauge the effectiveness of his training program.
Assuming that all the necessary conditions are met, calculate the standardized test statistic associated with the appropriate hypothesis test.
Round to the nearest hundredth.