STAT 100 Exam 1 (Chapters 1, 2, 3) – Verified Q&A 100% Correct ( Update)

STAT 100 EXAM 1 (CHAPTERS 1, 2, 3,)
QUESTIONS AND VERIFIED ANSWER;
100% CORRECT; 2026- 2027 UPDATE


- a (small) selection of individuals or objects taken from a
population - correct answer- Sample


- Is described by a symmetric, bell shaped curve
- It is used to model all the measurements in an entire
population - correct answer- Normal distribution


- the number that has 25% of the data set below it
- median of the lower half of the data - correct answer-
Q1 = 1st Quartile


- the number that has 75% of the data set below it
- median of the upper half of data - correct answer- Q3 =
3rd Quartile


1 peak - correct answer- unimodal

, A graphical summary for displaying categorical data - correct
answer- Relative frequency bar chart


About ____ of the population is within 1 standard deviation of
the mean - correct answer- 68%


About ______ of the population is within 2 standard deviations
of the mean - correct answer- 95%


About ______ of the population is within 3 standard deviations
of the mean - correct answer- 99.7%


any characteristic of an individual that we can measure. A
variable can take
different values for different individuals. - correct answer-
variable


Can be used to illustrate the relationship between two
quantitative variables - correct answer- A scatterplot


can pull the mean up or down. The median is less sensitive -
correct answer- Skewness or outliers