Suppose a historian wants to estimate the true mean number of children per household in New York City in 1900. The historian randomly selects 200 household census records from New York City. She records the number of children residing in each household. The historian then computes the mean number of children per household among these 200 households. Classify each description as one of a parameter, variable, population, sample, data, or statistic. Each classification has one description. (a) the mean number of children per household in New York City in 1900(b) the 200 households selected by the historian the mean number of children per household in the historian's sample(c) all of the households in New York City in 1900(d) the 200 records collected by the historian(e) a quantity equivalent to the number of children in a randomly selected household