The threat to validity that is likely to occur in the scenario above is Selection Bias.
<h3>What is Selection Bias?</h3>
This occurs when a researcher has control and intentionally chooses those who are going to be researched, observed, or studied. To eliminate this bias, the scientist must ensure that the sample population is selected very randomly.
Other threats to validity are:
- History
- Maturation
- Attrition
- Social Interaction
- Instrumentation
- Testing
- Regression to the mean, etc.
Please see the link below for more about Threat to Validity:
brainly.com/question/4168290
The correct answer
alterations in glutamate levels can produce schizophrenic like symptoms in normal subjects.
Answer:
Personality
Explanation:
As described by Scheier and Carver in 1985 optimism could be described as a balanced trait of personality, linked to positive expectations about future events. Optimists are the individuals expecting good things to happen to them, while pessimists contradicts them by their expectation in negative things. as per the question, Matt saw things from the bright side which is a trait of optimist personality.