In an intervention study to determine whether a vegetarian diet can college women to lose weight, 500 residents of a women's dormitory were divided into two groups: one that ate in a vegetarian dining hall and one that ate a normal diet. women were allowed to choose which group they wished to be in. after three months, the vegetarian group had lost an average of 10 pounds while the control group had not lost weight. what is the most likely source of error in this study? a. reporting bias b. the placebo effect c. random variation d. selection bias

Speaker 1: now that we are independent, americans should create a government that mirrors the government of great britain. speaker 2: after experiencing a tyranny of great britain, americans know how important it is to limit the government's power. speaker 3: our victory in the revolutionary war prove that americans have wisdom to choose good leaders. speaker 4: as for former colonies, the american states are likely to thrive under a system of strong centralized government. which speaker would most likely support the government established by the articles of confederation? a. speaker 2 b. speaker 3 c. speaker 1 d. speaker 4

Though most presidents have claimed affiliation with a christian church, the only roman catholic president has been a) abraham lincoln. b) john f. kennedy. c) george washington. d) franklin d. roosevelt.

When a explodes, radioactive material is dispersed. understanding terrorism: select the best answer from the choices provided. a. germ bomb b. dirty bomb c. chemical explosive d. commercial airplane