PSYCH 002.Section 1 Quiz

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PSYCH 002.Section 1 Quiz
2011-02-04 01:51:58

Section 1 Quiz Cards
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  1. What is a population?
    is any group in which a researcher is interested. A population can be large, such as all registered voters in San Joaquin County, or small such as all registered voters at San Joaquin Delta College.
  2. What is a sample?
    it is a smaller group culled from a population.
  3. What is a statistic?
    scores from a sample.
  4. Descriptive statistics do what?
    they summarize and describe data. For example, an average would be a descriptive statistic.

    (Descriptive statistics are large numbers with data)
  5. Inferential statistics do what?
    they generalize from a population to a sample (inferring the sample is representative of the population)
  6. What is a frequency?
    the number of individuals or cases; its symbol is f.
  7. What is a percentage?
    indicates the number per hundred who have a certain characteristic; its symbol is P or %.
  8. What is a proportion?
    is a part of one signified by a fraction or decimal.
  9. Scales of measurement are?
    • N ominal (NAMING)
    • O rdinal (ORDERING)
    • I nterval (NO ZERO POINT)
    • R atio (ZERO POINT)
  10. Nominal is...?
    (NAMING) A word scale of measurement listing by classification e.g. gender, race, age, etc.
  11. Ordinal is..."
    (ORDERING) A word scale of measurement listing by some degree of order or ranking e.g. mild, moderate, severe
  12. Interval is...?
    (NO ZERO POINT) A number scale of measurement noting equal distance with no meaningful zero point e.g. SAT scores from 200-800
  13. Ratio is...?
    (ZERO POINT) A number scale of measurement noting equal distance with a meaningful zero point e.g. weight lost or gained, dollars in pocket
  14. A frequency distribution ...?
    shows how many individuals had each score, either individually or by score intervals
  15. The symbol X stands for...?
    the scores
  16. A cumulative frequency ...?
    indicates how many individuals are in and below a given score interval

    • Formula:
    • start at bottom with lowest score
    • add next line up from f
    • add from frequency all the way up.
    • Top cf should be equal the sum of the f
  17. Formula for percentage is...?
    take f and divide by N
  18. Formula for cumulative percentage...?
    take cf and divide by N
  19. Rounding off numbers are as follows:
    • .075000 = .08 (to the nearest even #)
    • .065000 = .06 (to the nearest even #)