The threat to instrumentation refers to the threat to validity that comes from the instrument used when collecting data. In this case, the instrument can be the one used to code the behavior and it can also be the undergraduate research assistants. I suggest that, because there is more than one undergraduate research assistant participating in the study, Dr. LaGuardia should have a meeting before with them to be clear about the behaviors they will be observing, the instrument provided for them should also be clear and should leave no place for subjectivity when coding the behaviors observed.
Answer:
A planet is diffrent from a moon because planets revolve around the sun but moons revolve aroud the planets. They are also diffrent because the moon is smaller than earth so it has a weaker gravitational pull so you weigh less on the moon.
Explanation:
French navigator Jacques Cartier becomes the first European explorer to discover the St. Lawrence River in present-day Quebec, Canada<span>. In 1534, Cartier was commissioned by King Francis
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hope this helps. please give me brainiest :)
The answer to your question is d