A Research has shown that patients' expectations of treatment effectiveness are affected by what a treatment provider is wearing. A white lab coat tends to increase their expectation of effectiveness. Gloria, a research assistant, had no preconceived ideas about her research project, but by chance she wore a white lab coat when working with experimental Group but jeans and a t-shirt when working with experimental Group 2. This created a confounding variable. This confounding variable was a

A. Random effect
B. Placebo effect
C. Selection effect
D. Experimenter effect

after the signature of the treaty of versailles in june 1919, germany lost nearly 25,000 square miles and a population of 7 million people. these territories included eupen-malmedy area and moresnet which were ceded to belgium. regarding relations with france, germany ceded the sovereignty of the saar coal mines to this country, as well as the provinces of alsace-lorraine.

explanation:

ayy yo mom let me get your number and your looks because look at my background thats me

explanation:

the question is the text structure of this passage is. a. chronological order. b. problem and solution. c. cause and effect. d. compare and contrast.