A <u>double-blind experiment </u>allows researchers to identify the specific effects of the independent variable from the possible effects of the experimenter's and the participants' expectations about it.
<u>Explanation</u>:
The double-blind experiment is conducted to ensure that the results of the experiments are not biased. The double-blind study states that the person who is implementing the experiment and the person involved in the experiment are not aware of each other. So there will be no bias in the experimental treatment.
The reliability in the double-blind experiment is improved. Under this experiment unintentional tipping off the study participants and biasing of the evaluation results by the researchers can be avoided.
 
        
             
        
        
        
Answer:
Telegrafía, fotografía, ferrocarriles, barcos de vapor, acorazados y hospitales sanitarios.
Explicación:
La telegrafía, la fotografía, los ferrocarriles, los barcos de vapor, los acorazados y los hospitales sanitarios son tecnologías y medios de comunicación que se aplicaron en la Guerra de Crimea de 1853-56. Estas tecnologías son nuevas para el mundo y esta Guerra de Crimea es responsable de la creación de estas tecnologías y medios de comunicación. Estos medios de comunicación como la telegrafía y la fotografía crearon un enorme entusiasmo público y ayudaron a hacer de la guerra un espectáculo para el público que se encontraba lejos de la vista de la guerra.
 
        
             
        
        
        
One of the effect of the increase in leisure time is the development of public places that built for the people who wanted to enjoy their leisure time, such as library, public parks, coffee shops, etc
        
             
        
        
        
Answer: Ming Dynasty
What China was called at the time that Christopher Columbus discovered America?
Well first, Christopher Columbus discovered America in 1492. In 1492 was also the Ming Dynasty that lasted from 1368-1644. At the time China was one of the the world's largest, richest, and oldest civilization. Hence, China at the time of  Christopher Columbus's was called the Ming Dynasty.
 
        
             
        
        
        
Answer:
<em>It was the only way to protect their shipping and trade with the native populations in the New World- third choice</em>