Something is significant if it is something unusual or rare. This is also true in statistics. Something is significant if the probability of it occurring is very small. Thus it is significant.

Explain to your classmates the purpose of a critical value. What is it used for? Also, explain the difference in a one-tail test and two-tailed test. What causes these to be different and where would you use a one-tail test instead of a two-tailed test?

Significance leads to the importance of testing. What is the purpose of the null hypothesis? What is the purpose of the alternative hypothesis? Explain what inferences or decisions you are able to make and not make from the test.

There is no word limit, explain each in enough detail with a few sentences.