How would you test for statistical significance when performing a regression analysis using a t-test?
What will be an ideal response?
a. For small samples we use the t-distribution; as the sample grows past 30 or 40 the t-distribution increasingly approximates the standard normal. A general practice is to compute t statistics for each coefficient and compare the observed value with a critical t (or z) based on N – K – 1 degrees of freedom. The observed t values are calculated, as the coefficient divided by its standard error. The t can be checked against a critical value obtained from a t table by choosing the appropriate alpha level and number of tails. If the absolute value of the t score is greater than the t critical value, the result is statistically significant.
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Which country sided with Iraq rather than the United States in the First Gulf War?
a. Jordan b. Syria c. Egypt d. Saudi Arabia
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What will be an ideal response?
The international governmental organization that provides loans to member states for specific development projects is known as the
a. United Nations Conference on Trade and Development. b. World Trade Organization. c. World Bank. d. Security Council. e. International Monetary Fund.
What was the Supreme Court's ruling in United States v. Windsor?
A) It defined what marriage is and is not. B) It ruled that states do not have to recognize same-sex marriages. C) It ruled that states do not have to recognize same-sex marriages from other states. D) It ruled that federal discrimination against same-sex couples violated the Fourteenth Amendment.