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Statistics

Central Tendency Measures
Geometric Mean
Measures of Location
Measures of Position
Medidas de Forma

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  1. Which of the following is NOT a measure of central tendency?
    1. Median
    2. Mode
    3. Variance
  2. What is the mean test score for the 15 scores listed below?
    5          6          4          7          8
    1          2          0          6          9
    8          4          8          6          3
    1. 6
    2. 5,1333…
    3. 6,111…
  3. A small business recorded the number of computers that were faulty each day for 10 days:
  4. 1          1          2          2          2          2          3          3          3          3
    Find the mode.
    1. 2
    2. 2 and 3
    3. The is no mode
  5. The number of minutes a train is late each day for a period of 10 days are:
    0          1          2          2          2          3          3          3          3          5
    Find the median.
    1. 2’5
    2. 2 and 3
    3. There is no median
  6. Second quartile coincides with the
    1. mean
    2. median
    3. mode
  7. A group of friend have the following hair colours:
    black          blonde            black           blonde           red          
    brown          black             brown          brown           blonde
    The mean is:
    1. Brown
    2. Blonde
    3. The mean cannot be calculated
  8. Which of the following is NOT a measure of dispersion?
    1. Range
    2. Mean deviation
    3. Skewness
  9. The coefficient of variation is not very useful when:
    1. the mean value is near zero
    2. the extrema values are very big
    3. there coefficient of variayion can always be calculated
  10. A distribution is called leptokurtic when:
    1. the excess kurtosis is positive
    2. the excess kurtosis is zero
    3. the excess kurtosis is negative
  11. When the skeness is positive:
    1. the distribution is skewed to the right
    2. the distribution is symmetrical
    3. the distribution is skewed to the left