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
The Fifteenth reconstruction amendment (1869) was intended to protect freedmen against the injustices depicted in this cartoon.
In 1869, Congress passed a constitutional amendment guaranteeing black suffrage.
The Civil War Amendments, often known as the Reconstruction Amendments, are the Thirteenth, Fourteenth, and Fifteenth Amendments to the United States Constitution, which were ratified between 1865 and 1870.
The Thirteenth Amendment (1864) outlawed slavery and involuntary servitude.
The Fourteenth Amendment (1866) emphasizes citizenship rights and equal legal protection for all people.
The Fifteenth Amendment (1869) forbids discrimination in citizens' voting rights based on "race, color, or prior condition of servitude."
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Answer:
We need a picture?? There is no picture.
Complete question;
<em>The distribution of lengths of salmon from a certain river is approximately normal with a standard deviation of 3.5 inches. If 10 percent of salmon are longer than 30 inches, which of the following is closest to the mean of the distribution? 26 inches A 28 inches B 30 inches C 33 inches D 34 inches</em>
Option B is correct. The value that is closest to the mean of the distribution is 30inches.
The formula for calculating the z-score is expressed as:
Given the following parameters
If 10 percent of salmon are longer than 30 inches, then:
Using the z table to get the value corresponding to the mean area 0.1.
- The required z-score will be -1.285
Substitute the resulting parameters into the formula to get the mean of the distribution.
Hence the value that is closest to the mean of the distribution is 30inches.
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Rollie Tremaine is the one boy that Jerry and the others did not want to get a Grover Cleveland card.
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