Sorry this isn’t an answer but do all schools take a star test?
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
Use the linear formula y=m x + b
Based on the information given, the ranking will be Vendor B, Vendor D, and Vendor C.
Vendor B must be the first vendor to be chosen because it is the dominant vendor across all the three vendors stated in the question and has better ratings when compared to other vendors.
Vendor D is the second choice of vendor since it outperforms Vendor C. Vendor C must be the third choice of vendor since, in case of flexibility and timely product shipment, vendor D outperforms it.
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