The eight threats are history, maturation, testing, selection bias, statistical regression, instrumentation, selection maturation and mortality. The first threat I will discuss will be history. ... Another threat to internal validity is testing. This threat only occurs in the pre-post design which is where and pre-test and a post-test are given. ... This occurs when alternate forms of tests are given. ...

• Word Count: 722
• Approx Pages: 3
• Grade Level: High School

In 1995 the internet was privatized and the World wide web was born, and the rest is history. ... As I am a bilingual, I have tested out translating Korean into English using translation websites, and the result, although seemingly well written at first glance, was not comprehensible. ... Perhaps his predictions weren't as dramatic as his predictions in the new book, such as that we will all be living in a world of virtual reality, but they all did come true, so I think he passes the reliability test with this one. ...

• Word Count: 2555
• Approx Pages: 10
• Grade Level: High School

These discoveries were arguably his most important, and certainly those for which history has best remembered him. ... Galileo claimed to have seen mountains on the Moon, to have proved the Milky Way was made up of tiny stars, and to have seen four small bodies orbiting Jupiter (History of Mathematics). ...

• Word Count: 4135
• Approx Pages: 17
• Grade Level: High School