Question
In: Statistics and Probability
A cloth manufacturing company claims that the mean tearing strength of their curtain fabric is 120...
A cloth manufacturing company claims that the mean tearing strength of their curtain fabric is 120 pounds. A government inspection agency conducted tests on 100 curtain lengths revealing a mean strength of 115 pounds with a standard deviation of 20 pounds. At the 1% level of significance, does the governments’ information support the manufacturer’s claim?
State what is given, what are the hypothesis, what is the test statistic, draw a graph, find the p-value and state the conclusion. As an addition, state at what level of significance you would reject the zero hypothesis.
Solutions
orchestra answered 2 years agoRelated Solutions
Question: A cloth manufacturing company claims that the mean tearing strength of their curtain fabric is...
Question: A cloth manufacturing company claims that the mean
tearing strength of their
curtain fabric is 120 pounds. A government inspection agency
conducted tests on 49 curtain
lengths revealing a mean strength of 115 pounds with a standard
deviation of 20 pounds. At the
10% level of significance, does the governments’ information show
that the mean tearing
strength of the fabric is lower than manufacturer’s claim?
The tensile strength of a fiber used in manufacturing cloth is of interest to the purchaser....
The tensile strength of a fiber used in manufacturing cloth is
of interest to the purchaser. Previous experience indicates that
the standard deviation of tensile strength is 2 psi. A random
sample of eight fiber specimens is selected, and the average
tensile strength is found to be 127 psi. USING MINITAB
(please show all work)
(a) Test the hypothesis that the mean tensile strength equals
125 psi versus the alternative that the mean exceeds 125 psi. Use a
= 0.05....
A company manufacturing light bulbs is testing a new model. The company claims that the mean...
A company manufacturing light bulbs is testing a new model. The
company claims that the mean life time is less than 1000 hours.
A sample of 16 light bulbs are found to have sample mean of
987.5 hours and a sample variance of 400.
(a) Test this claim at the significance level α = 0.02.
Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
(b) Is there any assumption needed to solve this question? if
yes please state the...
3. A paint manufacturing company claims that the mean drying time for its paints is not...
3. A paint manufacturing company claims that the mean drying time
for its paints is not longer than 60 minutes. A random sample of 20
gallons of paints selected from the production line of this company
showed that the mean drying time for this sample is 63.50 minutes
with a sample standard deviation of 4 min utes. Assume that the drying times
for these paints have a normal distribution. Test the claim that
the mean drying time for its paints...
A company claims that a new manufacturing process changes the mean amount of aluminum needed for...
A company claims that a new manufacturing process changes the
mean amount of aluminum needed for cans and therefore changes the
weight. Independent random samples of aluminum cans made by the old
process and the new process are taken. The summary statistics are
given below. Is their evidence the 5% significance level (or 95
confidence level) to support the claim that the mean weight for all
old cans is different than the mean weight for all new cans
?Justify fully!...
A company claims that a new manufacturing process changes the mean amount of aluminum needed for...
A company claims that a new manufacturing process changes the
mean amount of aluminum needed for cans and therefore changes the
weight. Independent random samples of aluminum cans made by the old
process and the new process are taken. The summary statistics are
given below. Is there evidence at the 5% significance level (or 95%
confidence level) to support the claim that the mean weight for all
old cans is different than the mean weight for all new cans?
Justify...
A fishing line manufacturer claims that the new X-25 series has a mean tensile strength (...
A fishing line manufacturer claims that the new X-25 series has
a mean tensile strength ( ) of 25 psi and a standard deviation ( )
of 3 psi. To verify the claim, a ??sample of 25 specimens was
tested and yielded the following results:
32 19 27 24 28 29 38 30 25 33 18 25 37 28 20 32 23 21 25 19 23
27 32 26 30
A. Compute the sample median, sample mode, sample mean, sample...
Pottery Ranch Inc. has been manufacturing its own finials for its curtain rods. The company is...
Pottery Ranch Inc. has been manufacturing its own finials for
its curtain rods. The company is currently operating at 100% of
capacity, and variable manufacturing overhead is charged to
production at the rate of 56% of direct labor cost. The direct
materials and direct labor cost per unit to make a pair of finials
are $4 and $5, respectively. Normal production is 25,800 curtain
rods per year. A supplier offers to make a pair of finials at a
price of...
Pottery Ranch Inc. has been manufacturing its own finials for its curtain rods. The company...
Pottery Ranch Inc. has been manufacturing
its own finials for its curtain rods. The company is currently
operating at 100% of capacity, and
variable manufacturing is
charged to production at the rate of 70% of direct labor cost. The
direct materials and the direct labor cost
per unit to make a pair of
finials are $4 and $5, respectively. Normal production is 30,000
curtain rods per year.
A
supplier offers to make a pair of finials at a...
A manufacturing company produces electric insulators. You define the variable of interest as the strength of...
A manufacturing company produces electric
insulators. You define the variable of interest as the strength of
the insulators. If the insulators break when in use, a short
circuit is likely. To test the strength of the insulators, you
carry out destructive testing to determine how much force is
required to break the insulators. You measure force by observing
how many pounds are applied to the insulator before it breaks. You
collect the force data for 30 insulators selected for the...
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