Statistics Study Guide 2026
Everything you need to pass the Statistics exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 Statistics Exam Format at a Glance
📚 Statistics Topics to Study (55)
✍️ Sample Statistics Questions & Answers
1. Which regression diagnostic plot is used to check the linearity and homoscedasticity assumptions?
Plotting residuals against fitted values reveals non-linear patterns and changing variance (heteroscedasticity).
2. A marketing team asks if an A/B test result is 'good enough to act on.' What statistical concept should guide your answer?
Actionability depends on significance (low false-positive risk), effect size (meaningful magnitude), and whether the impact justifies implementation cost.
3. The number needed to treat (NNT) is calculated as:
NNT = 1 / ARR; it tells clinicians how many patients must be treated to prevent one additional adverse outcome.
4. Which organization publishes the most widely cited ethical guidelines specifically for statisticians in the United States?
The ASA's 'Ethical Guidelines for Statistical Practice' is the primary professional ethics document for U.S. statisticians.
5. What is the primary value of case study analysis in Statistics training?
This is fundamental to Statistics practice. Developing critical thinking by applying theory to realistic professional scenarios represents the professional standard for practical in the Statistics certification framework.
6. If a random variable X is normally distributed with mean 50 and SD 10, what is P(X < 60)?
X = 60 corresponds to z = (60−50)/10 = 1.0; the area below z = 1.0 is approximately 0.8413.