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Stats 151

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Termini in questo insieme (27)

  • Non-numerical data is called what?

    Categorical/Qualitative data

  • Numerical data is called what?

    Numerical/Quantitative data

  • Variable

    A characteristic that varies from one person to another

  • Data

    Values of a variable in a sample

  • Discrete numerical data

    numerical variable in which values can be listed but we can miss possible values (like fractions and decimals)

  • Continuous numerical data

    numerical variable in which all possible values in between numbers like fractions and decimals are all used

  • Nominal qualitative data

    non-numerical data that has no rank of sequence

  • Ordinal qualitative data

    non-numerical data that has a rank of sequence

  • Frequency

    Number of times a particular distinct value of a variable occurs in a sample

  • Distribution of a variable

    A table or formula that tells us what values a variable takes and their frequency in which these values are seen in a population

  • Relative frequency

    How often a distinct value of a variable shows up in a sample in a percentage

  • Pie chart

    A chart where a disk is divided into wedge shaped pieces proportional to the relative frequencies of the categorical data

  • Graphical methods

    Helps in visualizing the information in a frequency/relative frequency table

  • Bar chart

    A chart displaying categorical data on a horizontal axis and the relative frequencies or frequencies is on the vertical axis

  • Frequency/Relative frequency tables

    summarize information of single (univariate) categorical data

  • Contingency tables

    Summarize the information of two sets (bivariate) of categorical data

  • Descriptive statistics

    statistics to summarize and organize information, making averages, variations, and percentages, and graphs

  • Inferential statistics

    Statistcs to take a a sample from a population and looking at the data in order to come to a conclusion about the whole population

  • Population

    collection of all individuals under consideration in a statistical study

  • Sample

    A part of the population from which the information is found from

  • Observational study

    A study where no treatments or controls are used, only observing charateristics.

    Can only be used to find association between variables

  • Designed experiment

    Implying controls and treatments first in a study, collecting data with a plan

    Allows to find the causation of a specific effect or outcome, how one variable affects another variable

  • Census

    Collecting data from all individuals in the population

  • Sampling

    Collecting data from a sample of the population

  • SRS (Simple random sample)

    Each sample taken has a equal chance of being selected

  • SRS without replacement

    an individual can only appear in a sample once

  • SRS with replacement

    an individual can appear in a sample more than once