1. The absolute value
of the difference between the point estimate and the population parameter it
estimates is
A. standard
error
B. sampling
error
C. precision
D. error
of confidence
E. none
of the above


2. A probability
statement about the sampling error is known as the
A. confidence
B. precision
C. interval
D. error
E. none
of the above


3. If we want to
provide a 95% confidence interval for the mean of a population, the
confidence coefficient is
A. 0.485
B. 1.96
C. 0.95
D. 1.645
E. none
of the above


4. The variance of a
population is known to be 400. At 95% confidence, the margin of error
will be
A. 39.2
or less
B. 3.92
or less
C. 3.29
or less
D. 78.4
or less
E. none
of the above


5. In order to
estimate the average time spent on the computer terminals per student at a
local university, data were collected for a sample of 81 business students
over a one week period. Assume the population standard deviation is 1.2
hours. With a 0.95 probability, the margin of error is
approximately
A. 7.5
B. 0.014
C. 0.160
D. 0.2613


6. In order to
estimate the average time spent on the computer terminals per student at a
local university, data were collected for a sample of 81 business students
over a one week period. Assume the population standard deviation is 1.2
hours. If the sample mean is 9 hours, then the 95% confidence interval
is
A. 7.04
to 110.96 hours
B. 7.36
to 10.64 hours
C. 7.80
to 10.20 hours
D. 8.74
to 9.26 hours


7. The t value with a
95% confidence and 24 degrees of freedom is
A. 1.711
B. 2.064
C. 2.492
D. 2.069
E. none
of the above


8. A 95% confidence
interval for a population mean is determined to be 100 to 120. If the
confidence coefficient is reduced to 0.90, the interval for m
A. becomes
narrower
B. becomes
wider
C. does
not change
D. becomes
0.1
E. none
of the above


9. A sample of 16
elements from a normally distributed population is selected. The sample
mean is 10 with a standard deviation of 4. The 95% confidence interval
for m is
A. 8.040
to 11.96
B. 1.476
to 18.524
C. 2.160
to 17.840
D. 7.869
to 12.131
E. none
of the above


10. A random sample of
144 observations has a mean of 20, a median of 21, and a mode of 22.
The population standard deviation is known to equal 4.8. The 95.44%
confidence interval for the population mean is
A. 15.2
to 24.8
B. 19.200
to 20.800
C. 19.216
to 20.784
D. 21.2
to 22.8
E. none
of the above
