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Category > Psychology Posted 12 Oct 2017 My Price 10.00

to help you prepare and organize for Exam

Can I get help with this study guide for psychology class?

PHSC 354 S TUDY G UIDE : E XAM 4 This study guide is meant to help you prepare and organize for Exam 4 (Module/Week 8) for PSYC 354. The material is arranged by subject and not necessarily chronologically (according to chapter). It is recommended that you work through from beginning to end and let your instructor know if you have any questions. Also, remember that there is always a small percentage of cumulative material, so it will help to look over notes from previous modules/weeks. Confidence Intervals: 1. Define a point estimate. Define an interval estimate. What is the relationship between the two? 2. Brief overview: The margin of error expresses an interval estimate and is often used in polling. Take the following values from a Gallup Poll conducted in June 2014 ( http://www.gallup.com/poll/171710/public-faith-congress-falls-again-hits-historic- low.aspx ): a. Only 7% of Americans report having a great deal or quite a lot of confidence in Congress. b. Compare that to 74% of Americans who have the same level of confidence in the Military. Both of the percentages above would be considered point estimates. The Gallup organization also reports a margin of error of +/-4 percentage points, or +/-4%, for these values. Using the point estimates and the margin of error, we can compute the interval estimate: a. For Congress: 7 +/- 4 = 3 to 11% Our interval estimate is 3% to 11% b. For the Military: 74 +/- 4 = 70 to 78%. Our interval estimate is 70% - 78%. We can also work backwards from an interval estimate to a point estimate: a. Gallup reported an interval estimate for confidence in small business ranging from 58% to 66%. What is the point estimate? To find the answer, just work in towards the center to find the median. Halfway between 58 and 66 is 62%, so 62% is our point estimate. Also, if you know the point estimate and are given the interval estimate, you can calculate the margin of error simply by subtracting the point estimate from the upper value of the interval estimate, etc. So, if your point estimate is 45 and your interval estimate is 43 to 47, what is the margin of error? 3. Define a confidence interval. Is it more like a point estimate or an interval estimate? What value is the confidence interval usually centered around? 4. Which is larger: a 95% confidence interval or an 85% confidence interval? 5. Confidence intervals can be useful in hypothesis testing. Say your null hypothesis states that the expected value on a measure is 15. You run the study, and the results give you a 95% confidence interval of 17.2 to 21.3 on the measure. Does the value of 15 lie within this confidence interval? In this case, would you reject or fail to reject the null hypothesis? What if the confidence interval were 13.5 to 18.3—reject or fail to reject the null? Page 1 of 2
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CourseLover
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Status NEW Posted 12 Oct 2017 07:10 AM My Price 10.00

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