Given a data set, how do you know whether to calculate sigma or s? choose the correct answer below. a. if the given data set contains a large number of entries, then s is calculated. if the data set contains a small number of entries, then sigma is calculated. b. if the given data set contains a large number of entries, then sigma is calculated. if the data set contains a small number of entries, then s is calculated. c. when given a data set, one would have to determine if it represented the population or if it was a sample taken from the population. if the data are a population, then s is calculated. if the data are a sample, then sigma is calculated. d. when given a data set, one would have to determine if it represented the population or if it was a sample taken from the population. if the data are a population, then sigma is calculated. if the data are a sample, then s is calculated.