I'm almost 100% sure the answer is Private
The more kids then the more help they got with work. Plus there wasn't any protection back then as we have now
Answer: Greenland
Explanation:
Kaffeklubben Island in Greenland is the northernmost point in North America. Latitude 83°40'N
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