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ECN 221 Practice Exam 3 Study Guide 2026 | Economics Review, Practice Questions & Test Prep

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ECN 221 Practice Exam 3 Study Guide 2026 | Economics Review, Practice Questions & Test Prep

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ECN 221 Practice Exam 3 Study Guide 2026 | Economics Review, Practice
Questions & Test Prep


90% confidence level to z score - ANS ✔✔1.645



95% confidence level to z score - ANS ✔✔1.96



98% confidence level to z score - ANS ✔✔2.33



99% confidence level to z score - ANS ✔✔2.575



When the range between the lower 95% and upper 95% confidence interval for the
independent variable coefficient includes the value of zero... - ANS ✔✔The null hypothesis of no
(of zero) relationship is not rejected. We can reach the same conclusion for the independent
variable



If p-value is .0759 and alpha is 0.05, what do we do with the null hypothesis? - ANS ✔✔We fail
to reject the null hypothesis



If F statistic is 8.655 and the critical value is 2.701, what do you do with the null hypothesis? -
ANS ✔✔We reject the null hypothesis. The test statistic is larger than the critical value so we
reject the null



If alpha is .05 and the p-value is .0004159, what do we do with the null hypothesis? - ANS
✔✔The p-value is small and less than .05 so there is significant evidence contradicting the null
hypothesis



For a two tail test if the test statistic is closer to 0 than either of the critical values... - ANS
✔✔then we fail to reject the null hypothesis

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