Question
12
4 / 4
points
Two different analytical tests can be used to determine the impurity level in steel alloys. Eight specimens
are tested using both procedures, and the results are shown in the following tabulation. Use alpha=0.01.
Determine the test statistic.
(see image)
A)
.1538
B)
-3.48
C)
3.499

D)
1.960
Question
13
4 / 4
points
Two different analytical tests can be used to determine the impurity level in steel alloys. Eight specimens
are tested using both procedures, and the results are shown in the following tabulation. Use alpha=0.01.
Is there sufficient evidence to conclude that tests differ?
(see image)

Question
14
4 / 4
points
Two different analytical tests can be used to determine the impurity level in steel alloys. Eight specimens
are tested using both procedures, and the results are shown in the following tabulation. If the mean
from Test 1 is 0.1 less than the mean from Test 2, it is important to detect this with probability at least
0.90. Was the use of eight alloys an adequate sample size? If not, how many alloys should have been
used?
(see image)
8

Question
15
4 / 4
points
Consider the following film speed data: n1 = 8, n2 = 8, s1 = 0.11, s2 = 0.09. Test H0:variance 1= variance2
versus H1: variance1≠ variance2 using alpha = 0.02. Determine the test statistic.

Question
16
4 / 4
points
Consider the following film speed data: n1 = 8, n2 = 8, s1 = 0.11, s2 = 0.09. Test H0:variance 1= variance2
versus H1: variance1≠ variance2 using alpha = 0.02. Determine the critical value.
A)
6.99
B)
1.49
C)
1.22
D)
.93

Question
17
4 / 4
points
The F distribution is used to conduct hypothesis tests and construct confidence intervals about the
standard deviation of two independent normal populations.

Question
18
4 / 4
points
Data from an experiment considered the variability in repeated measurements of the weight of a sheet
of paper. The sample standard deviation from 15 measurements was 0.0083 grams. The 95% confidence
interval is [.00607, .013]. Does the measurement standard deviation differ from 0.01 grams at alpha = .
05?