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?
1. 0.16
2. 0.025
3. 0.016
4. 0.05
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
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