Question
In: Statistics and Probability
An engineering group is testing a new curing method for steel beams to improve their tensile...
An engineering group is testing a new curing method for steel beams to improve their tensile strength. The tensile strength for the steel beams it currently uses averages 58 pounds per square inch (psi). A random sample of 36 beams cured with the new method showed an average tensile strength of 63 psi with a standard deviation of 8.1 psi.
a. Test at the 2.5% significance level if the curing process increases the tensile strength of the steel beams.
b. What does a Type II error mean in the context of this application?
Solutions
orchestra answered 2 years agoRelated Solutions
Tensile testing can someone tell me how to calcualte the true strain, engineering strain, true stress...
Tensile testing
can someone tell me how to calcualte the true strain,
engineering strain, true stress and engineering stress of the
following data o got from tensile testing machine. I assumed area
to be constant during the test
i need to draw the curves of the true and engineeing in excel
please
TESTNUM
POINTNUM
TIME
POSIT
FORCE
EXT
Area
5368
1
0.156
-5E-05
347.6111
-0.00138
0.0628
5368
2
0.58
-5E-05
348.3641
0
0.0628
5368
3
0.777
0.0007
363.0201
0.021787
0.0628...
Tensile testing can someone tell me how to calcualte the true strain, engineering strain, true stress...
Tensile testing
can someone tell me how to calcualte the true strain,
engineering strain, true stress and engineering stress of the
following data o got from tensile testing machine. I assumed area
to be constant during the test
i need to draw the curves of the true and engineeing in excel
please
TESTNUM
POINTNUM
TIME
POSIT
FORCE
EXT
Area
5368
1
0.156
-5E-05
347.6111
-0.00138
0.0628
5368
2
0.58
-5E-05
348.3641
0
0.0628
5368
3
0.777
0.0007
363.0201
0.021787
0.0628...
The average tensile strength of carbon fiber cloth is 600 MPa. You are testing a new...
The average tensile strength of carbon fiber cloth is 600 MPa.
You are testing a new weaving pattern for the carbon fiber threads
and want to know if this new weave causes a difference in the
tensile strength. After testing 18 samples of the new weave, you
found a sample average of 585 MPa with a standard deviation of 34
MPa. At a significance level of 0.05, test to see if this new weave
has a different mean than 600...
A group of researchers has developed a method that they hypothesize will improve the reading ability...
A group of researchers has developed a method that they
hypothesize will improve the reading ability of at-risk 1st grade
students. They randomly selected nine students to participate in
their study. The nine students were administered a reading test,
then trained for 10 weeks using the new reading program, and then
readministered the reading test. The following data are their
scores:
Subject 1st Reading 2nd Reading
Score Score
1 23 19
2 20 19
3 24
21
4 24
24
5 24 22
6 19
17
7 17
15
8 18 16
9 20 18
What...
A.) A group of engineers developed a new design for a steel cable. They need to...
A.) A group of engineers developed a new design for a steel
cable. They need to estimate the amount of weight the cable can
hold. The weight limit will be reported on cable packaging. The
engineers take a random sample of 43 cables and apply weights to
each of them until they break. The 43 cables have a mean breaking
weight of 774.3 lb. The standard deviation of the breaking weight
for the sample is 15.4 lb.
Find the 90%...
A group of engineers developed a new design for a steel cable. They need to estimate...
A group of engineers developed a new design for a steel cable.
They need to estimate the amount of weight the cable can hold. The
weight limit will be reported on cable packaging. The engineers
take a random sample of 47 cables and apply weights to each of them
until they break. The 47 cables have a mean breaking weight of
777.4 lb. The standard deviation of the breaking weight for the
sample is 15.5 lb.
Find the 90% confidence...
A group of engineers developed a new design for a steel cable. They need to estimate...
A group of engineers developed a new design for a steel cable.
They need to estimate the amount of weight the cable can hold. The
weight limit will be reported on cable packaging. The engineers
take a random sample of 43 cables and apply weights to each of them
until they break. The 43 cables have a mean breaking weight of
774.3 lb. The standard deviation of the breaking weight for the
sample is 15.4 lb.
Find the 90% confidence...
A group of engineers developed a new design for a steel cable. They need to estimate...
A group of engineers developed a new design for a steel cable.
They need to estimate the amount of weight the cable can hold. The
weight limit will be reported on cable packaging. The engineers
take a random sample of 47 cables and apply weights to each of them
until they break. The 47 cables have a mean breaking weight of
777.4 lb. The standard deviation of the breaking weight for the
sample is 15.5 lb. Find the 90% confidence...
A group of engineers developed a new design for a steel cable. They need to estimate...
A group of engineers developed a new design for a steel cable.
They need to estimate the amount of weight the cable can hold. The
weight limit will be reported on cable packaging. The engineers
take a random sample of 50 cables and apply weights to each of them
until they break. The 50 cables have a mean breaking weight of
774.6 lb. The standard deviation of the breaking weight for the
sample is 15.1 lb. Find the 99% confidence...
A group of engineers developed a new design for a steel cable. They need to estimate...
A group of engineers developed a new design for a steel cable.
They need to estimate the amount of weight the cable can hold. The
weight limit will be reported on cable packaging. The engineers
take a random sample of 40 cables and apply weights to each of them
until they break. The 40 cables have a mean breaking weight of
775.3 lb. The standard deviation of the breaking weight for the
sample is 14.9 lb. Find the 90% confidence...
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