1 The law of large numbers affects sampling procedure how?
a Large numbers indicate relatively large sampling errors.
b Large samples create distributions with small mean values.
c Large samples tend to minimize sampling error.
d Large numbers eliminate sampling error.
2 A z-score of 2.0 is two standard deviations above the mean of the distribution (t).
True
False
3 In a distribution for which the mean is 25 and the standard deviation is 5, what percentage of all scores occur between 20 and 30?
a 34.13%
b 68.26%
c 84.13%
d 92.39%
4 How is the z-test different from z-score analysis?
A The z-test compares a sample to a population.
b The z-test calculates a value of z which can be compared to Table A.
c The z-test provides a way to evaluate how individuals compare to a population.
d The z-test is based on how individual scores compare to a sample mean
5 What is the critical value of t for a two-tailed t-test in which n = 10?
a 2.262
b 2.228
c .05
d .01
6 In the z transformation formula, z = (x – M)/s the x stands for __________.
a an unknown value
b the mean of the z distribution
c the standard deviation of the distribution
d the value to be transformed into z
7 Rejecting the null hypothesis is the same as saying _____________.
a any differences are random differences
b the result is statistically significant
c the hypothesis of difference is rejected
d the research hypothesis is rejected
8 The z-score transformation makes non-normal scores normal.
True
False
9 The z scores is a ratio of difference to variability (t)
True
False
10 Question 10 of 10 A z-score of 0 occurs at a point beyond 75% of all scores (f).
True
False
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