Polluted water, plants dying and structures corroding.
In May 1915, the Lusitania was sank by a German U-Boat. About 1200 lives were lost, many hundreds of whom were American. Naturally, the Americans became angry that the Germans sank a ship full of passengers without provocation
13th amendment
"Neither slavery nor involuntary servitude, except as punishment for a crime whereof the party shall have been duly convicted, shall exist in the United States."
Carl von Clausewitz was a Major General and military theorist born in Prussia. One of his most famous writings was Vom Kriege.
Answer:
Ceiling effect
Explanation:
Full question
Hannah wants to see if her new technique of ping-pong playing can increase one's ping-pong performance. She asks the U.S. Olympic ping-pong team to work with her. Half of the U.S Olympic team is randomly assigned to be taught by the new style, the experimental group, and the other randomly assigned half are not, the control group. Her technique does not significantly increase the performance of the experimental group compared to the control group, perhaps because they are already so good at the sport. This could be an example of
a. the need for matching groups.
b. a ceiling effect.
c. the need for determining initial comparability.
d. an internally invalid study.* .
Ceiling effect
In Hannah case the experimental group and the control group was pretty much not significantly different because both groups were already good at the sport. Her experiment couldnt function properly because there is no accuracy to the test since both groups perform well, this is known as a ceiling effect
The term ceiling effect is a measurement limitation that occurs when the highest possible score or close to the highest score on a test or measurement instrument is reached, thereby decreasing the likelihood that the testing instrument has accurately measured the intended group.
