1. Practice Quiz , True/False

  1. ____ For any population, a z-score of -2.00 indicate a more extreme location (farther from the mean) than a z-score of +1.00

  2. ____ Within any distribution of scores, the location specified by z = +1 and the location specified by z = -1 are exactly the same distance from the mean.

  3. ____ For any population, a z-score of +1.00 corresponds to a location exactly 1 unit of standard deviation above the mean.

  4. ____ If a population of N = 10 scores is transformed into z-scores, there will be five positive z-scores and five negative z-scores.

  5. ____ In any population of scores, at least one individual will have a z-score of zero.

  6. ____ As sample size increases, the magnitude of the standard error value decreases.

  7. ____ The population mean always corresponds to a z-score of zero.

  8. ____ The standard error will always be less than or equal to the standard deviation.

  9. ____ The mean of the distribution of sample means is always equal to the population mean.

  10. ____ The value for a probability can never exceed 1.00, unless you have made a computational error.

2. Multiple Choice:

  1. What proportion of a normal distribution is located in the tail beyond a z-score or z = -1.00?
    1. 0.16
    2. 0.025
    3. 0.016
    4. 0.05
  2. When a random sample is selected from a population, the sample mean is not expected to be exactly equal to the population mean. On average, the distance between a sample mean and the population mean is predicted by ____.
    1. the standard error
    2. the expected value
    3. the mean of the population
    4. the standard deviation of the population

  3. The distribution of sample means _____.
    1. is normal only if the population distribution is normal
    2. is normal only if the sample size is greater than 30
    3. none of the above


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