A hypothesis is the stated relationship between variables and is the first step in testing the validity of a theory. It is based on observations made regarding the independent and dependent variables. The independent variable is the behavior that may be manipulated or changed. The independent variable affects the dependent variable. In this example, your independent variable would be whether or not a teen is pregnant. The dependent variable is the resulting behavior of the independent variable, in this case, whether or not a teen completes high school. A hypothesis must be testable and measurable. “Teen pregnancy increases the high school completion rate of teenagers” or “Teen pregnancy decreases the high school completion rate of teenagers” would both work as a hypothesis for this study. When testing a theory, you would also want to include a null hypothesis. A null hypothesis shows that there is no significant relationship between the variables. A null hypothesis for this study could state “Teen pregnancies result in no significant difference in the high school completion rate of teens.”
Does anybody know the etymology of the phrase "sweet dreams"? I tried googling but did not find anything satisfying. Is this a relatively new phrase of the modern world or has this been in use for some time? I think it's the latter one. Answer The OED has the interjection as "a farewell to someone going to bed" from the 20th century: 1908 Sears Roebuck Catal. 198/1 Tenor Solos..Good Bye, Sweet Dreams, Good Bye. But it goes back until at least the 19th and possibly 18th centuries. John Wolcot, writing under the pseudonym of Peter Pindar, used it in his poem "Orson and Ellen; A Legendary Tale" published in 1801: Also from 1801 in The infernal Quixote (Page 287) by Charles Lucas: In the March 1776 of The Universal Magazine was published "The Serenade. A Pastoral Tale. From the German of Gesner" , where the shepherd Daphnis watches over his beloved as she sleeps and sings: The same tale appears in 1776's as Idyl XI, " Daphnis ...
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