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7. use the aggregate() function to compute the sample sizes (ozn), means (ozm), and standard deviations (ozsd) for the control and ozone treatment groups, and then compute the standard errors (ozse) for both groups. make sure the numeric values are visible in your output. copy/paste your r commands and the resulting output into the green box below. (1 point)
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7. use the aggregate() function to compute the sample sizes (ozn), means (ozm), and standard deviati...
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