{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

# exam2Sp08 - Exam 2 Spring 2008 1 Name Psych Stats Spring...

This preview shows pages 1–4. Sign up to view the full content.

Exam 2 Spring 2008 Name_________________________ Psych Stats Spring 2008 Brannick Exam 2 Instructions: Write your name and U number on the scantron. Answer any 50 of 55 questions on the exam by bubbling in the best of the four alternatives given. For those questions you wish to omit, bubble in “e.” If you answer all 55, I will choose the last 5 for you, so it is in your interest to pick 5 and bubble in “e”. You can take the printed exam with you. Give the scantron to your lab instructor (or proctor) when you are done. Handy formulas: N X X σ σ = N s s X X 2 = ; 1 ) ( 2 2 - - = N X X s X X X z σ μ - = X obt s X t μ - = X z X CI σ 05 . % 95 ± = X s t X CI 05 . % 95 ± = SD X X z - = N X X = Tabled values of z, the unit normal. Z Between mean and z Beyond z Z Between mean and z Beyond z 0.00 0.0 50.00 0.90 31.5 18.41 0.10 3.98 46.02 1.00 34.13 15.87 0.20 7.93 42.07 1.10 36.43 13.57 0.30 11.79 38.21 1.20 38.49 11.51 0.40 15.54 34.46 1.30 40.32 09.68 0.50 19.15 30.85 1.40 41.92 08.08 0.60 22.57 27.43 1.50 43.32 06.68 0.70 25.80 24.20 1.60 44.52 05.48 0.80 28.81 21.19 1.65 45.00 05.00 1.70 45.54 04.46 1.96 97.50 02.50 Critical values of t , alpha = .05, two-tails df t df t 1 12.706 6 2.447 2 4.303 7 2.365 3 3.182 8 2.306 4 2.776 9 2.262 5 2.571 10 2.228 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Exam 2 Spring 2008 Chapter 5 Standard Error of the Mean 1. The standard deviation of the sampling distribution is called the: a. Mean Error b. Standard deviation c. Standard Error d. Standard Variance 2. The sampling distribution is a distribution of what? 3. Suppose 100 people were sampled and the standard deviation was found to be 10. What would the standard error be? 4. The output shown below (next page) is based on self-reported age data from this class. What is the standard deviation of age for this class? 5. For the same data, what is the stardard error of the mean? a. .47 b. 6.24 c. 21.88 d. 39.96 2
Exam 2 Spring 2008 Descriptives Statistic Std. Error Age Mean 21.8786 .47453 95% Confidence Interval for Mean Lower Bound 20.9420 Upper Bound 22.8153 5% Trimmed Mean 20.8237 Median 20.0000 Variance 38.956 Std. Deviation 6.24148 Minimum 17.00 Maximum 49.00 Range 32.00 Interquartile Range 4.00 Skewness 2.866 .185 Kurtosis 8.369 .367 6. A biased statistic is a statistic for which the mean of the sampling distribution ______. 7. What happens to the standard error of the mean as the sample size increases?

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern