This thesis statement is an effective comparison\contrast statement because:
It mentions the two objects of comparison; A Jury of Her Peers and The Lamb of the Slaughter.
It explains what things are alike in both texts; use of symbolism, point of view and characterization to explore the stereotypical roles of women in the early twentieth century.
It includes what the author would like for the reader to understand about the topic, which in this case is the stereotypical roles of women in the early twentieth century.