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19. Does a woman's chance of suffering from postpartum depression vary depending on the number of children she already has? To find out, a researcher collected random samples from four groups of women: the first group having just given birth to their first child, the second group having just given birth to their second child, and so on. He then rated their amount of postpartum depression on a scale from 1 to 5. Test the null hypothesis that the chances of developing postpartum depression do not differ with the number of children to which a woman has previously given birth. First Second Third Fourth Child Child Child Child 2 4 AW-UIW NOWUU U - N WA NW