Online Resources for POGO 511 Screening-Exam

Sample Screening Exam Review & Study Materials

Question 1: Digesting Research
To help you prepare for this question, please review the following Khan Academy videos:

• Statistical Questions
• Types of Statistical Studies
• Hypothesis Testing (watch “Simple Hypothesis Testing”)

Question 2: Standard Errors and Confidence Intervals of Point Estimates
This question provides summary statistics for a variable, including number of observations, mean, standard deviation, minimum and maximum. You must use this information to calculate the standard error, the 99% confidence interval, and the location of the population parameter. To help you prep for this question, please review the following Khan Academy videos:

• Finding Mean, Median and Mode
• Interpreting and Comparing Data Distributions
• Inferring Population Mean from a Sample Mean
• Variance of Population
• Sample Variance
• Inferential Statistics
• Standard Error of the Mean
• Confidence Interval I

Question 3: Proportion Estimation
This question focuses on  standard errors and confidence intervals, and the videos above remain relevant. In addition, please check out the following tutorials:

• Margin of Error I
• Margin of Error II

Question 4: Basic Graphics
This question shows a box plot and asks for interpretation. To prepare, please review these videos and focus on the following topics:

• Box and Whisper Plots
• Constructing a Box and Whisper Plot
• Interpreting Quartiles

Question 5: Levels of Measurement 
This question asks for a five number summary, which includes the minimum, first quartile, median, third quartile and maximum. Please review the videos above.

Question 6: Math Problem
To help  you prepare for this problem, please review the following videos:

• Variation Ratio
• IQR (Interquartile Range)
• The Normal Distribution (including the sample problems using z-scores)

Khan Academy Tutorials

The 511 screening exam covers the topics listed HERE. The following video tutorials cover many of the topics tested on the exam.

Research Design

• Research questions
• Hypothesis testing
• Variables

Graphics

• Histograms
• Box Plots
• Bar Charts
• Pie Charts
• Scatterplots

Distributions

• Dot Plots and Frequency Tables
• Percent
• Proportion
• Cumulative

Univariate Measures

• Level of measurement
• Central tendency 
• Dispersion (all of the videos in this section)
• Z scores
• Outliers

Statistical Inference

• Law of large numbers
• Central Limit Theorem

Standard Errors Tutorial and Video

• Standard Errors of ratio and interval level data – see above
• Standard Errors of proportions- see above

Confidence Intervals

• Margin of Error
• Confidence Intervals (all the videos)
• Basic Sample Size Estimation Videos here or here