This question is incomplete, here´s the complete question.
Wei-Chin designed a self-report inventory to measure how intimate partners express affection and hostility toward each other. The inventory is a list of positive behaviors (e.g., back rubs, holding hands) and negative behaviors (e.g., slamming doors, raising voices). After having a wide range of couples complete the inventory, Wei-Chin finds that happy couples endorse all the affection items and unhappy couples endorse all the hostile items. Which of the following problems prevents him from concluding that happy couples exchange more affectionate behaviors than unhappy couples?
1. sentiment override
2. item-overlap problem
3. correlation does not imply causation
4. social desirability effect
Answer: 3. Correlation does not imply causation.
Explanation:
Correlation is a statistical technique that evaluates how much two variables are linearly related, meaning they change together. However, two variables being correlated does not necessarily mean that one causes the other. Causation states that any change in a variable will cause a change in another variable.
The fact that happy couples endorsed all the positive behaviors, and unhappy couples the negative ones, shows that there´s a correlation, but it doesn't necessarily mean that unhappiness causes couples to exchange more negative behaviors, or vice-versa.
I believe the answer is: Smallpox has been eradicated by a worldwide vaccination program
Vaccines develop an immunity toward the virus. In order to survive, virus need to obtain a host so they could replicate. Due to the vaccine, the viruses cannot find these hosts. Because of this, smallpox virus started to gradually decreased and eventually eradicated.
Answer:
Reference to the Rio Grande boundary of Texas was omitted from the U.S. Congress's annexation resolution to help secure passage after the annexation treaty failed in the Senate. President Polk claimed the Rio Grande boundary, and when Mexico sent forces over the Rio Grande, this provoked a dispute.
Explanation:
Question: Which of the following situations would be likely to cause scarcity?
Choices:
A) canals and roads that improved trade across longer distances
B) a natural disaster which destroyed many farms in a region
C) one group taking control of all agricultural production in a region
D) lack of money to purchase improved equipment for farming
Answer: <u>B) A natural disaster which destroyed many farms in a region.</u>
<em>Hope this helps!.</em>
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<em>~A.W~ZoomZoom44</em>
