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Question 17 of 20 -15 Current Attemptin Progress The table below lists the observed frequencies for all four categories for an experiment. Category Observed Frequency 12 2 13 3 19 4 16 The null hypothesis for the goodness-of-fit test is that the proportion of all elements of the population that belong to each of the four categories is the same. What is the expected frequency for the second category? i The null hypothesis for the goodness-of-fit test is that the proportion of all elements of the population that belong to each of the four categories is the same. The expected frequencies for the four categories are: X N O W S