Answer:
b. Carryover effects
Explanation:
THESE ARE THE OPTIONS FOR THE QUESTION BELOW
a. Sampling effects
b. Carryover effects
c. Participant attrition
d. Participant fatigue
From the question, we are informed about a researcher who uses a within-subjects design in which one group completes a difficult puzzle and the second group completes an easy puzzle. He finds that participants who completed the difficult puzzle first were able to learn about the puzzle and completed the easy puzzle quicker, compared to participants who did the easy puzzle first. In this case, the type of threat to internal validity was described in this example was Carryover effects. A carryover effect can be regarded as an effect which is been carried over from one experimental condition up to another experimental condition. It is any lingering effects resulting from a previous experimental condition which has any on current experimental condition.Common type of carryover effect is known as practice effect , in this effect participants perform a task better when performing in later conditions since there was a chance to practice it in time past.
C. Today’s terrorists have access to modern technology and weapons
The detail from "the city without us" most clearly shows that nature is more powerful than it appears is the size of the Japanese insect that can kill hemlock trees. “The City Without Us,” is particularly relevant — if depressing — for New Yorkers because it portrays a city robbed of its eight million people, submerged by water from below, then ravaged by devastating fires, and finally overgrown with vegetation.
it typically takes seven to ten days to return the ashes to the family.
Building the Panama Canal, 1903–1914
To that end, in 1850 the United States and Great Britain negotiated the Clayton-Bulwer Treaty to rein in rivalry over a proposed canal through the Central American Republic of Nicaragua.
