2 A researcher surveys employees at a major manufacturing plant to determine rates of productivity. She wonders whether workers are less productive in the morning than in the evening. What is the null hypothesis? A) Workers are less productive in the morning than in the evening B) Workers are neither productive in the morning or evening C) Workers are equally productive in the morning and evening D) Workers are not less productive in the morning Question 4 In order to reject the null hypothesis, the obtained Z score must be: A) more extreme than the cutoff score on the comparison distribution where the null hypothesis is false B) less extreme than the cutoff score on the comparison distribution where the null hypothesis is false C) less extreme than the cutoff score on the comparison distribution where the null hypothesis is true D) more extreme than the cutoff score on the comparison distribution where the null hypothesis is true