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In the Triangle Shirtwaist Factory Fire, a population of 146 garment workers died.

Statistical values such as mean and standard deviation that are calculated using the sample are called statistics. For example, the mean length of pencils (in cm) equal to 13 is computed from a sample of 30 pencils. Thus, the value 13 is a statistic.

Statistical values such as mean and standard deviation that are calculated using the population are called parameters. For example, the mean weight of mice (in g) equal to 30 is computed from an entire population of 700 mice. Thus, the value 30 is a parameter.

The value of 146 garment workers who died in the disaster comprises all the workers of the Triangle Shirtwaist Factory. It is the size of a population.

Therefore, it is a parameter.