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Probabilities & Z-Scores w/ Graphing Calculator definitions

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  • TI-84 Calculator
    A handheld device with specialized functions for statistical calculations, including probability and z-score computations for normal distributions.
  • Standard Normal Distribution
    A bell-shaped curve with a mean of zero and a standard deviation of one, used as a reference for z-score and probability calculations.
  • Normalcdf
    A calculator function that computes the probability for a specified range under the standard normal curve using lower and upper bounds.
  • Inverse Normal
    A calculator function that determines the z-score corresponding to a given probability or area under the standard normal curve.
  • Z-Score
    A numerical value indicating how many standard deviations a data point is from the mean in a normal distribution.
  • Lower Bound
    The leftmost value input for probability calculations, often set to a large negative number to approximate negative infinity.
  • Upper Bound
    The rightmost value input for probability calculations, representing the endpoint of the area under the curve.
  • Mu
    The mean value of a distribution, set to zero for the standard normal curve in calculator computations.
  • Sigma
    The standard deviation of a distribution, set to one for the standard normal curve in calculator computations.
  • Tail
    The section of the distribution (left, right, or center) selected when finding z-scores from probabilities using calculator functions.
  • Area
    The region under the normal curve corresponding to a probability, visually represented as a shaded portion on graphs.
  • Window Settings
    Graphing parameters adjusted on the calculator to ensure the normal curve and shaded regions are visible and accurate.
  • Draw Tab
    A calculator menu option that displays the normal distribution graph with shaded probability regions for visual confirmation.
  • Clear Draw
    A calculator function that removes the current graph, allowing for new probability or z-score calculations without confusion.
  • Z Table
    A reference chart listing probabilities for z-scores, traditionally used before calculators streamlined these computations.