The technique to improve internal validity is D) Addition of a control group.
<h3>What is
internal validity?</h3>
Internal validity serves as the study which bring about the establishment of a trustworthy cause-and-effect relationship that can be found in treatment and an outcome.
it should be noted that Internal validity also helps to eliminate alternative explanations , hence, The technique to improve internal validity is D) Addition of a control group.
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COMPLETE QUESTOIN:
Which of the following is a technique to improve internal validity ____________?
A) Experimenter expectancy
B) Participant bias
C) Use of a confederate
D) Addition of a control group
Answer: A. Essential (flexible) expense.
Explanation:
Edge 2021
Sorry but didn’t get the question
<u>ANSWER:
</u>
Until the late 1800s, the purpose of secondary education in the US was a basic one where the children under all age groups were taught in a common room in the school. The students of secondary classes are meant to teach the primary ones.
<u>EXPLANATION:
</u>
- It has also been said that until the late 1800s, girls and minorities were not given admission to high schools for secondary education.
- During the late 1800s, Boston opened a public high school for girls so that women acquired an opportunity to learn secondary education.
Answer:
-12
Explanation:
We are given information to solve for 2 variables x and y. To solve this I substituted 3x for y in the equation 5x - 4y = 21
So substituting gets us 5x - 4(3x) = 21
and we can solve the equation for x
5x - 12x = 21
-7x = 21
x = -3
Now that we have found x, we can find y simply by putting it in the equation y = 3x
y = 3(-3) = -9
Once we have both variables, we can find the answer to x + y
-3 + -9 = -3 - 9 = -12
So the answer to the question
x + y = -12
