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Indietro

Chap 1

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Termini in questo insieme (18)

  • ·      a collection of methods for planning studies and experiments, obtaining data, and then organizing, summarizing, presenting, analyzing, interpreting, and drawing conclusions based on the data

    Statistics

  • a complete collection of all elements to be studied.

    Population

  • a collection of data from every member of the population

    Census

  • Subcollection of members selected from a population. The objective is to use the sample data as a basis for drawing a conclusion about he whole population

    Sample

  • a numerical measurement describing some characteristic of a populatin

    Parameter

  • a numerical measurement describing some characteristic of a sample

    Statistic

  • numbers representing counts or measurements

    Quantitative data

  • can be separated into different categories that are distinguished by some non-numeric characteristic

    Qualitative data

  • result when the number of possible values is either a finite number or a countable number

    Discrete Data

  • result from infinitely many possible values that correspond to some continuous scale that covers a range of values without gaps, interruptions or jumps

    Continuous Data

  • the method used to collect sample data influences the quality of the statistical analysis

    Collecting sample data

  • measures specific traits it does not modify subjects

    Observation

  • applying a treatment and then measuring the effect on the subject.

    Experiments

  • large enough to see the true nature of any effects and obtain that sample using an appropriate method, such as one based on randomness

    Sample Size

  • Each member of a population has an equal chance of being selected in the sample

    Random

  • each group of size N has an equal chance of being selected.

    Simple Random Sample

  • use data that are very easy to get not random

    Convenience Sampling

  • one in which the respondents themselves decide whether to be included.

    Voluntary response sample or self-selected sample