Statistics Chapter 1,2,3,4

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trulyfe89
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36331
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Statistics Chapter 1,2,3,4
Updated:
2010-09-21 15:16:47
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Math
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Math exam 1
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  1. The two major types of statistics are ______ statistics and _____ statistics.
    Inferential, Descriptive
  2. What is the difference in the conclusion drawn from a designed experiment an observational study?
    Oberservational can only reveal association, where designed experiments can show causation
  3. Describe advantages and disadvantages of cluster sampling.
    • Advantages: Easier, faster, less expensive
    • Disadvantage: cluster sampling is not that accurate, each cluster will probably not be the same as the other clusters
  4. Age Percentage not covered
    18-24 28.2
    25-39 24.9
    40-54 19.1
    55-65 16.5
    Classify the study as either descriptive or inferential
    Inferential
  5. Define Observational Study
    researchers observe characteristics and take measurements
  6. Define Designed experiment
    researchers impose treatments and controls
  7. Descriptive Statistics
    consists of methods for organizing and summarizing information
  8. inferential statistics
    consists of methods for drawing and measuring the reliability of conclusions about a population based on info obtained from a sample of the population
  9. Contingency table represent what specific kind of discrete data
    bivariate data
  10. what is the equation for Chebyshev's Rule
    100(1-(1/k2) %
  11. How many data points are you trimming off for 20 data points with a 10% trimmed mean?
    4 in total...2 on top and 2 on the bottom
  12. Qualitative variable
    nonnumerical variable
  13. Quantitative variable
    numerical variable
  14. variable
    characteristic that varies from one person or thing to another
  15. data
    values of a variable
  16. qualitative data
    values of a qualitative variable
  17. quantitative data
    values of a quantitative variable
  18. discrete variable
    quantitative variable whose possible values can be listed
  19. continuous variable
    quantitative variable whose possible values form some interval of numbers
  20. a table that provides the classes, frequencies, relative frequencies, and midpoints of a data is called a _______
    grouped-data table
  21. A positive Z score indicates that the observation is ______ the mean, whereas a negative Z score indicates that the observation is _____ the mean.
    above, below
  22. A standardized variable always has mean ____ and standard deviation ____
    0, 1
  23. interpret this z score.

    Z = 10.16 - 3.00 = 2.24
    3.20
    the data 10.16 is 2.24 standard deviation above the mean of 3.00
  24. difference between a parameter and a statistic
    a parameter is a measure of the population and a statistic is a measure of a sample
  25. mutually exclusive events
    no two of them have outcomes in common

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