STAT 200 EXAM 2 STUDY GUIDE 2026 SOLVED QUESTIONS

STAT 200 EXAM 2 STUDY GUIDE 2026 SOLVED
QUESTIONS

◉ Standard Deviation. Answer: Sensitive to outliers and skewness.


◉ Standard Deviation. Answer: If variability increases → then SD
increases.


◉ Five-Number Summary. Answer: Minimum, Q1, Median, Q3,
Maximum.


◉ Five-Number Summary. Answer: Basis for boxplots.


◉ Five-Number Summary. Answer: If asked to describe distribution
using quartiles → then use the five-number summary.


◉ Z-Score. Answer: Number of standard deviations a value is from
the mean.


◉ Z-Score. Answer: Positive = above mean, Negative = below mean.


◉ Z-Score. Answer: If |z| > 2 → then the value is unusual.

, ◉ Empirical Rule. Answer: 68%, 95%, 99.7% of data fall within 1, 2,
3 SD of the mean for bell-shaped data.


◉ Empirical Rule. Answer: Only applies to normal distributions.


◉ Empirical Rule. Answer: If data are skewed → then do NOT use the
rule.


◉ Histogram. Answer: Graph of quantitative data showing
distribution shape.


◉ Histogram. Answer: Bars touch; displays skew, symmetry,
modality.


◉ Histogram. Answer: If asked about shape → then use the
histogram.


◉ Boxplot. Answer: Graph showing quartiles, median, spread, and
outliers.


◉ Boxplot. Answer: Outliers shown as dots beyond whiskers.