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1. Since the
population size is always larger than the sample size, then the sample
statistic
A. can
never be larger than the population parameter
B. can
never be equal to the population parameter
C. can
never be zero
D. can
never be smaller than the population parameter
E. none
of the above
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2. The mean of a
sample
A. is
always equal to the mean of the population
B. is
always smaller than the mean of the population
C. is
computed by summing the data values and dividing the sum by (n-1)
D. is
computed by summing all the data values and dividing the sample size
E. none
of the above
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3. When the smallest
and largest percentage of items are removed from a data set and the mean is
computed, the mean of the remaining data is
A. the
median
B. the
mode
C. the
trimmed mean
D. any
of the above
E. none
of the above
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4. Since the mode is
the most frequently occurring data value, it
A. can
never be larger than the mean
B. is
always larger than the median
C. is
always larger than the mean
D. must
have the value of at least 2
E. none
of the above
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5. The 50th percentile
is the
A. mode
B. median
C. mean
D. third
quartile
E. none
of the above
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6. The standard
deviation of 64 observations equals 25. The variance of the sample
equals
A. 5
B. 8
C. 625
D. 4096
E. none of the above
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The next 2 questions use the
data given below. The mean of the sample is 5.
3 5 12
3 2
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7. The variance is
A. 80
B. 4.062
C. 13.2
D. 16.5
E. none of the above
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8. The coefficient of
variation is
A. 72.66%
B. 81.24%
C. 264%
D. 330%
E. none of the above
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9. Positive value of
covariance indicate
A. a positive value of the
x-values
B. a positive value of the y
values
C. the standard deviation is positive
D. positive relation between the
dependent and independent variables
E. none of the above
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10. The coefficient of
correlation ranges between
A. 0 and 1
B. -1 and +1
C. minus infinity and plus infinity
D. 1 and 100
E. none of the above
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