Median Calculation for Qualitative Data
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Questions and Answers

Which measure of central tendency is best suited for qualitative data?

  • Mean
  • Median (correct)
  • Mode
  • Range
  • What is a demerit of calculating the median?

  • It can be affected by extreme observations
  • It is a positional average
  • It is not affected by fluctuations in sampling
  • It cannot be determined for even number of observations (correct)
  • Which measure of central tendency can be calculated from a grouped frequency distribution?

  • Mean
  • Median
  • Standard Deviation
  • Mode (correct)
  • Which measure of variability measures how dispersed the data is in relation to the mean?

    <p>Standard Deviation</p> Signup and view all the answers

    What is another name for Quartile Deviation?

    <p>Interquartile Range</p> Signup and view all the answers

    What does a low standard deviation indicate about the data?

    <p>Data are clustered tightly around the mean</p> Signup and view all the answers

    What is another term for the statistical methods applied to biological problems?

    <p>Biostatistics</p> Signup and view all the answers

    Which term means 'Biological Measurement or Measurement of Life'?

    <p>Biometry</p> Signup and view all the answers

    What is the main purpose of using statistical tools in the field of Biostatistics?

    <p>To express facts, observations, or measurements in figures</p> Signup and view all the answers

    Which area is NOT typically associated with the application of Biostatistics?

    <p>Mathematical Statistics</p> Signup and view all the answers

    In what field is the application of statistics known as Medical Statistics?

    <p>Medicine</p> Signup and view all the answers

    Which statistical method is used to determine the association between two variables in Biostatistics?

    <p>Finding correlation between variables</p> Signup and view all the answers

    What is the final step in the Statistical Method according to Croxton and Gowden?

    <p>Interpretation of data</p> Signup and view all the answers

    Which measure of central tendency is defined as the 'positional average'?

    <p>Median</p> Signup and view all the answers

    What is a major merit of calculating the mean as a measure of central tendency?

    <p>It is least affected by sampling fluctuations</p> Signup and view all the answers

    Which step in the Statistical Method focuses on determining measures like correlation and regression?

    <p>Analysis of data</p> Signup and view all the answers

    What is a demerit associated with calculating the mean?

    <p>It is greatly affected by extreme fluctuations</p> Signup and view all the answers

    According to Croxton and Gowden, which characteristic does not apply to the mean as a measure of central tendency?

    <p>Greatly affected by extreme fluctuations</p> Signup and view all the answers

    In a Perfect Positive Correlation between two variables X and Y, what happens when there is a change in X?

    <p>Equal positive proportion of change in Y in the same direction</p> Signup and view all the answers

    What type of correlation is concluded when the change in one variable has no effect on the other variable?

    <p>Zero Correlation</p> Signup and view all the answers

    When the value of a variable increases and the value of the other variable decreases, what type of correlation is exhibited?

    <p>Perfectly Negative Correlation</p> Signup and view all the answers

    What characterizes Linear correlation between two variables?

    <p>Ratio of change in one variable to linear quantum of change in the other variable</p> Signup and view all the answers

    In a Zero Correlation between two variables X and Y, what happens when there is a change in X?

    <p>No effect on Y</p> Signup and view all the answers

    What does the coefficient of variation measure?

    <p>Dispersion around the mean</p> Signup and view all the answers

    How is correlation defined?

    <p>Average relationship between variables</p> Signup and view all the answers

    Which type of correlation involves the variables moving in the same direction?

    <p>Positive Correlation</p> Signup and view all the answers

    What is a characteristic of Positive Correlation?

    <p>Change in one variable causes change in another</p> Signup and view all the answers

    When is there a correlation between two variables?

    <p>When their values increase at the same rate</p> Signup and view all the answers

    What is Simple Correlation?

    <p>Correlation between two variables only</p> Signup and view all the answers

    Study Notes

    Measures of Central Tendency

    • Mode is the best suited measure for qualitative data
    • Median is a positional average, defined as the middle value of a dataset when it is arranged in order
    • Mean is a measure of central tendency that can be calculated from a grouped frequency distribution
    • A major merit of calculating the mean is that it takes into account every value in the dataset
    • A demerit of calculating the mean is that it is sensitive to extreme values

    Measures of Variability

    • Standard deviation measures how dispersed the data is in relation to the mean
    • A low standard deviation indicates that the data points are close to the mean
    • Quartile Deviation is also known as Semi-Interquartile Range
    • Coefficient of variation measures the ratio of standard deviation to the mean

    Biostatistics

    • Biostatistics is the application of statistical methods to biological problems
    • Biometry is another term for 'Biological Measurement or Measurement of Life'
    • The main purpose of using statistical tools in Biostatistics is to make informed decisions in medical and health-related fields
    • Medicine is the field where the application of statistics is known as Medical Statistics

    Statistical Methods

    • Regression is a statistical method used to determine the association between two variables in Biostatistics
    • The final step in the Statistical Method according to Croxton and Gowden is the interpretation of results
    • The step in the Statistical Method that focuses on determining measures like correlation and regression is the analysis of data

    Correlation

    • Correlation is defined as the degree of association between two variables
    • Positive Correlation involves the variables moving in the same direction
    • A characteristic of Positive Correlation is that when one variable increases, the other variable also increases
    • When the value of a variable increases and the value of the other variable decreases, it exhibits a Negative Correlation
    • When the change in one variable has no effect on the other variable, it is a Zero Correlation
    • In a Perfect Positive Correlation between two variables, when there is a change in X, Y also changes in the same direction
    • Linear correlation between two variables is characterized by a straight-line relationship between them
    • Simple Correlation is a type of correlation that involves only two variables
    • There is a correlation between two variables when changes in one variable are associated with changes in the other variable

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    Description

    Learn about how to calculate and understand the median, its merits, and demerits. Discover why it cannot be used for qualitative characteristics such as color of flowers or sweetness of fruits.

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