Ch. 7 Probability and the Normal Distribution

A set of vocabulary flashcards covering key terms related to probability and normal distribution.

Z Score

A statistical measurement that describes a value's relation to the mean of a group of values, expressed in terms of standard deviations.

Normal Distribution

A continuous probability distribution characterized by a symmetric bell-shaped curve, where most of the observations cluster around the central peak.

Mean (μ)

The average of a set of values, calculated by summing all values and dividing by the number of values.

Standard Deviation (σ)

A measure of the amount of variation or dispersion in a set of values.

Proportion

A part or portion of a whole, typically expressed as a fraction or percentage.

Z Table

A table that provides the area (probability) to the left of a given Z Score in a standard normal distribution.

Probability under the curve

The area under the probability density function (PDF) of a continuous random variable, representing the likelihood of a particular outcome.

Upper half of one percent

Refers to the scores that are higher than the bottom 0.5% in a normal distribution, determined by calculating the corresponding Z Score.

Percentile

A measure indicating the value below which a given percentage of observations fall.

Marketable Tree Diameter

The minimum diameter for trees to be considered commercially viable, determined by statistical analysis of the normal distribution.