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:
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
Graphics
Distributions
Univariate Measures
- Level of measurement
- Central tendency
- Dispersion (all of the videos in this section)
- Z scores
- Outliers
Statistical Inference
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