Dr. fletcher decides to give the same measure to another group of 55 participants who decided to not join a fraternity/sorority. doing this would dr. fletcher address all of the following threats to internal validity except:

Experimenter bias

Maturation

Selection

History

Explanation:

Experimenter bias  occurs when the researcher subconsciously affects the result of an experiment such that it delivers a given conclusion. It is one of the biases that are more difficult to prevent.

While carrying out an experiment, the researcher can start to lean towards an idea or a conclusion and start interpreting results to favor this idea. Double Blind techniques can be used to prevent this bias, this a process where the experimenter does not know who an experiment favors.

answer; i believe the best and correct answer is stronger bonds between the nations of africa;

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.