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1. Practice Quiz , True/False ¶
- ____ 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
- ____ 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.
- ____ For any population, a z-score of +1.00 corresponds to a location exactly 1 unit of standard deviation above the mean.
- ____ If a population of N = 10 scores is transformed into z-scores, there will be five positive z-scores and five negative z-scores.
- ____ In any population of scores, at least one individual will have a z-score of zero.
- ____ As sample size increases, the magnitude of the standard error value decreases.
- ____ The population mean always corresponds to a z-score of zero.
- ____ The standard error will always be less than or equal to the standard deviation.
- ____ The mean of the distribution of sample means is always equal to the population mean.
- ____ The value for a probability can never exceed 1.00, unless you have made a computational error.
2. Multiple Choice: ¶
- What proportion of a normal distribution is located in the tail beyond a z-score or z = -1.00?
- 0.16
- 0.025
- 0.016
- 0.05
- 0.16
- 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 ____.
- the standard error
- the expected value
- the mean of the population
- the standard deviation of the population
- the standard error
- The distribution of sample means _____.
- is normal only if the population distribution is normal
- is normal only if the sample size is greater than 30
- none of the above
- is normal only if the population distribution is normal