DOL SECTION 8 TEST QUESTIONS WITH
VERIFIED ANSWERS
8.1. A study was conducted on the relationship between the speed of different cars
and their gasoline
mileage. The correlation coefficient was found to be 0.35. Later, it was discovered
that there was a
defect in the speedometers and they had all been set 5 miles per hour too fast. The
correlation coefficient was computed using the corrected scores. Its new value will
be:
a. 0.30
b. 0.35
C. 0.40
d. -0.35
Answer b is correct.
8.2. Failure modes and effects analysis involve what activity?
a. The determination of the probability of failure in a specified period
b. The expected number of failures in a given time interval
c. The study of how a product fails and what causes the failure
d. A study of the probability of success in a given period
Answer c is correct.
8.3. A random sample size n is to be taken from a large population having a
standard deviation of 1". The
,sample size is to be determined so that there will be a 0.05 risk probability of
exceeding a 0.1"
tolerance error in using the sample mean to estimate m. Which of the following
values is nearest the
required sample size?
a. 385
b. 40
c. 200
d. 100
Answer a is correct.
8.5. Identify a non-value added activity that would be considered a form of
processing muda:
a. Any and all forms of transportation
b. An ergonomically unsound workplace
c. Reshaping a product due to poor dies
d. Producing more than needed by the customer
Answer c is correct.
8.6. The test used for testing significance in an analysis of variance table is the:
, a. Z test c. F-test
b. t test d. Chi-square test
Answer c is correct.
8.7. When constructing a power of test curve, one would not be surprised to
discover that as alpha (a)
increases:
a. The value of mu becomes greater
b. Beta decreases
c. The probability of rejecting the null hypothesis decreases
d. The sample size becomes larger
Answer b is correct.
8.8. When finding a confidence interval for mean m, based on a sample size of n:
a. Increasing n increases the interval
b. Having to use S, instead of n decreases the interval
c. The larger the interval, the better the estimate of µ
d. Increasing n decreases the interval
Answer d is correct.
8.13. Which of the following statements concerning the coefficient of simple linear
correlation, r, is true?
a. r = 0.00 represents the absence of a relationship
b. The relationship between the two variables must be nonlinear
c. r = 0.76 has the same predictive power as r = -0.76
d. r = 2.00 represents a perfect relationship
VERIFIED ANSWERS
8.1. A study was conducted on the relationship between the speed of different cars
and their gasoline
mileage. The correlation coefficient was found to be 0.35. Later, it was discovered
that there was a
defect in the speedometers and they had all been set 5 miles per hour too fast. The
correlation coefficient was computed using the corrected scores. Its new value will
be:
a. 0.30
b. 0.35
C. 0.40
d. -0.35
Answer b is correct.
8.2. Failure modes and effects analysis involve what activity?
a. The determination of the probability of failure in a specified period
b. The expected number of failures in a given time interval
c. The study of how a product fails and what causes the failure
d. A study of the probability of success in a given period
Answer c is correct.
8.3. A random sample size n is to be taken from a large population having a
standard deviation of 1". The
,sample size is to be determined so that there will be a 0.05 risk probability of
exceeding a 0.1"
tolerance error in using the sample mean to estimate m. Which of the following
values is nearest the
required sample size?
a. 385
b. 40
c. 200
d. 100
Answer a is correct.
8.5. Identify a non-value added activity that would be considered a form of
processing muda:
a. Any and all forms of transportation
b. An ergonomically unsound workplace
c. Reshaping a product due to poor dies
d. Producing more than needed by the customer
Answer c is correct.
8.6. The test used for testing significance in an analysis of variance table is the:
, a. Z test c. F-test
b. t test d. Chi-square test
Answer c is correct.
8.7. When constructing a power of test curve, one would not be surprised to
discover that as alpha (a)
increases:
a. The value of mu becomes greater
b. Beta decreases
c. The probability of rejecting the null hypothesis decreases
d. The sample size becomes larger
Answer b is correct.
8.8. When finding a confidence interval for mean m, based on a sample size of n:
a. Increasing n increases the interval
b. Having to use S, instead of n decreases the interval
c. The larger the interval, the better the estimate of µ
d. Increasing n decreases the interval
Answer d is correct.
8.13. Which of the following statements concerning the coefficient of simple linear
correlation, r, is true?
a. r = 0.00 represents the absence of a relationship
b. The relationship between the two variables must be nonlinear
c. r = 0.76 has the same predictive power as r = -0.76
d. r = 2.00 represents a perfect relationship
