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What may be inferred about the difference between Professor Aronson's studies and past studies?
The second sentence tells us that Past research... slightly biased or distorted the findings. The second paragraph then explains how Aronson improved on that research. According to the author, then, Aronson's research was clearer and more accurate than previous ones, or in other words - more reliable.
According to the passage, Professor Aronson differentiates between women who hold feminist beliefs from women who do not, which implies that she has her own classification system for feminism.
Any woman who labels herself a feminist would be considered a feminist under both past studies and those of Professor Aronson. This distractor simply uses a phrase from the third paragraph (working-class) to confuse you.
The passage tells us that past research has mistakenly identified a group of women as non-feminists despite their feminist beliefs and we can infer that Professor Aronson's research did not make this mistake.
While the passage tells us that Prof. Aronson has a wider definition of being feminist (identifying as a feminist AND holding feminists beliefs), we cannot assume that this definition actually includes more women than past definitions.
This is not a simple case of adding the numbers. Since there is also a time difference between the researches, it may be that the number of women who meet each definition has changed. Therefore, we cannot determine any absolute relation between the number of 'feminist' women in each research.