11. Ecologists wanted to estimate the mean biomass (amount of vegetation) of a certain forested region. The ecologists divided the region into plots measuring 1 square meter each, and they selected a random sample of 9 plots. The mean biomass of the 9 plots was 4.3 kilograms per square meter ( kg/m² ) and the standard deviation was 1.5 kg/m². Assuming all conditions for inference are met, which of the following is a 95 percent confidence interval for the population mean biomass, in kg/m² ? V1.5 (A) 4.3 ± 1.96| () (B) 4.3±1.96| V1.5 (C) 4.3 ± 2.306 9 (D) 4.3 ± 2.306( (E) 4.3 ± 2.306|용

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