Suppose we conduct a chi-square goodness of fit test to examine the distribution of eye colors in a population. We collect data from a random sample of 500 individuals and obtain the following observed frequencies: 100 with brown eyes, 200 with blue eyes, 120 with green eyes, and 80 with hazel eyes. The expected proportions are 40%, 15%, 20%, and 25%, respectively. To calculate the test statistic for this scenario, what would be the next step?

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