Statistics Hardest Practice Quiz! Trivia Test

44 Questions | Total Attempts: 314

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Statistics Hardest Practice Quiz! Trivia Test

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Questions and Answers
  • 1. 
    Statistics is the study of _____________.
    • A. 

      Testing and interpreting statistical hypotheses about a relationship

    • B. 

      Mathematical analysis using samples instead of populations

    • C. 

      Summarizing, analyzing, or drawing inferences about a relationship

    • D. 

      Inferring something about a population from a sample

  • 2. 
    Which of the following is not a variable?
    • A. 

      Personal fantasies

    • B. 

      The final score of the Yankees game on 10/17/09

    • C. 

      Body temperatures of people who are NOT sick

    • D. 

      Age

  • 3. 
    Why is it important to record demographics?
    • A. 

      Different populations act differently

    • B. 

      The IRB mandates it for studies conducted

    • C. 

      There's no way to tell if you're measuring a consistent estimator

    • D. 

      There's no way to tell if you're measuring a sufficient estimator

  • 4. 
    How is an ordinal variable more detailed than a nominal variable?
    • A. 

      0 means the total absence of the variable

    • B. 

      The categories are qualitative groupings

    • C. 

      The categories possess value

    • D. 

      The distance between the categories is equal

  • 5. 
    How is a ratio variable more detailed than an interval variable?
    • A. 

      0 means the total absence of the variable

    • B. 

      The categories are qualitative groupings

    • C. 

      The categories possess value

    • D. 

      The distance between the categories is equal

  • 6. 
    What kind of variable is a person's height?
    • A. 

      Discrete

    • B. 

      Continuous

    • C. 

      Ungrouped

    • D. 

      Grouped

  • 7. 
    What kind of frequency distribution is the above?
    • A. 

      Ungrouped frequency distribution

    • B. 

      Grouped frequency distribution

    • C. 

      Relative frequency distribution

    • D. 

      Cumulative frequency distribution

  • 8. 
    What kind of frequency distribution is the above?
    • A. 

      Ungrouped frequency distribution

    • B. 

      Grouped frequency distribution

    • C. 

      Relative frequency distribution

    • D. 

      Cumulative frequency distribution

  • 9. 
    What would a stem and leaf plot look like for:10, 11, 13, 13, 21, 31, 36
    • A. 

      10, 11, 13, 13 21 31, 36

    • B. 

      1 | 0, 1, 3, 3 2 | 1 3 | 1, 6

    • C. 

      10s X X X X 20s X 30s XX

    • D. 

      10s+ XXXX 20s+ XXXXX 30s+ XXXXXXX

  • 10. 
    In a positively skewed distribution, ____________.
    • A. 

      The bulk of the scores are on the left side

    • B. 

      The bulk of the scores are on the right side

  • 11. 
    Kurtosis is the measure of ______________.
    • A. 

      The amount that the peak is shifted positively or negatively

    • B. 

      The shape of the distribution's peak

    • C. 

      Whether the distribution has enough scores (N)

    • D. 

      The cumulative relative frequency

  • 12. 
    B would be described as being ___________.
    • A. 

      Mezokurtic

    • B. 

      Hypokurtic

    • C. 

      Platykurtic

    • D. 

      Leptokurtic

  • 13. 
    A would be described as _______________.
    • A. 

      Mezokurtic

    • B. 

      Hypokurtic

    • C. 

      Platykurtic

    • D. 

      Leptokurtic

  • 14. 
    The mode is an especially poor choice of measuring central tendency when ___________.
    • A. 

      The distribution is bimodal

    • B. 

      The distribution is heavily positively skewed

    • C. 

      The distribution is leptokurtic

    • D. 

      The distribution is a normal curve

  • 15. 
    The median is a better choice of measuring central tendency than the mean when _____________.
    • A. 

      The distribution is bimodal

    • B. 

      The distribution is heavily positively skewed

    • C. 

      The distribution is leptokurtic

    • D. 

      The distribution is a normal curve

  • 16. 
    The sum of deviations [ Summation (X-Xbar)] is always equal to ____________.
    • A. 

      The mean

    • B. 

      The median

    • C. 

      0

    • D. 

      It's possible for it to be different every time

  • 17. 
    In which of the following situations would just providing the mean without also providing variability be bad?
    • A. 

      Giving the mean number of meters a guided missile lands from the target but not the variability

    • B. 

      Giving the mean amount of IQ increase seen in children in a single year but not the variability

    • C. 

      Giving the mean number of crimes committed by a demographic but not the variability

    • D. 

      All of the above

  • 18. 
    ___________ is the measure of variability most affected by outlier scores.
    • A. 

      Range

    • B. 

      Interquartile range

    • C. 

      Variance

    • D. 

      Standard deviation

  • 19. 
    When calculating variance for a sample, we use the following formula:Sum of Squares / (N-1)What benefit is there to subtracting 1?
    • A. 

      Makes sure studies cannot be done with case studies (N=1)

    • B. 

      The lower the number of participants, the more the -1 increases sample variability

    • C. 

      If we don't subtract 1, the sum of deviations won't equal 0

    • D. 

      Subtracting 1 makes the distribution appear more normal like

  • 20. 
    Why do we use standard deviation instead of variance?
    • A. 

      Standard deviation takes into account the N of the sample

    • B. 

      Standard deviation is less susceptible to outlier scores than the variance.

    • C. 

      Standard deviation has the same scale of measurement as the mean

    • D. 

      Standard deviation takes into account degrees of freedom of the sample

  • 21. 
    Which of the following is not a requirement of a perfect normal distribution?
    • A. 

      Identical mean, median, and mode

    • B. 

      Asymptotic distribution

    • C. 

      Has a standard deviation of 1.

    • D. 

      Has range of negative infinity to positive infinity

  • 22. 
    Which of the following is not true of standard normal distributions?
    • A. 

      Standard deviation = 1

    • B. 

      Mean = 0

    • C. 

      Easier to compare values across variables

    • D. 

      Converting scores to a standard normal distribution turns the distribution into a perfect normal distribution

  • 23. 
    If I were to look at the scores on a test from a single classroom and assume the findings apply to the whole school, I would be using ___________.
    • A. 

      Descriptive statistics

    • B. 

      Inferential statistics

    • C. 

      Sample statistics

    • D. 

      Population statistics

  • 24. 
    Which of the following is true?
    • A. 

      All consistent estimators are unbiased estimators

    • B. 

      All unbiased estimators are consistent estimators

    • C. 

      Not all biased estimators are consistent estimators

    • D. 

      Consistent estimators are never biased estimators

  • 25. 
    Which of these is the crappiest type of sampling?
    • A. 

      Snowball sampling

    • B. 

      Convenience sampling

    • C. 

      Random sampling

    • D. 

      Stratified random sampling

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