Question
In: Statistics and Probability
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard...
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard deviation of 0.6 kg.
a. How many blocks must be sampled so that a 95% confidence interval will specify the mean mass to within ±0.1 kg? (Round up the final answer to the nearest integer.)
The number of blocks that must be sampled is:
b. How many blocks must be sampled so that a 99% confidence interval will specify the mean mass to within ±0.1 kg? (Round up the final answer to the nearest integer.)
The number of blocks that must be sampled is:
Solutions
orchestra answered 2 years agoRelated Solutions
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard...
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a
standard deviation of 0.4 kg.
Find a 95% confidence interval for the mean mass of this type of
concrete block. (Round the final answers to three decimal
places.)
The 95% confidence interval is
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a standard...
A sample of 75 concrete blocks had a mean mass of 38.3 kg with a
standard deviation of 0.6 kg.
a. Find a 95% confidence interval for the mean mass of this type
of concrete block. (Round the final answers to three decimal
places.)
The 95% confidence interval is ( , ).
b. Find a 99% confidence interval for the mean mass of this type
of concrete block. (Round the final answers to three decimal
places.)
The 99% confidence interval is ( , ).
This data is from a sample. Calculate the mean, standard deviation, and variance. x 38.3 35.2...
This data is from a sample. Calculate the mean,
standard deviation, and variance.
x
38.3
35.2
26.7
49.9
44.6
14.2
16.4
34
14.4
Please show the following answers to 2 decimal
places.
Sample Mean =
Sample Standard Deviation =
Sample Variance =
Ooops - now you discover that the data was actually from a
population! So now you must give the population
standard deviation.
Population Standard Deviation =
Blocks A (mass 2.00 kg ) and B (mass 12.00 kg , to the right of...
Blocks A (mass 2.00 kg ) and B (mass 12.00 kg , to the right of
A) move on a frictionless, horizontal surface. Initially, block B
is moving to the left at 0.500 m/s and block A is moving to the
right at 2.00 m/s. The blocks are equipped with ideal spring
bumpers. The collision is headon, so all motion before and after it
is along a straight line. Let +x be the direction of the initial
motion of A....
Blocks A (mass 3.00 kg) and B (mass 12.00 kg, to the right of A) move...
Blocks A (mass 3.00 kg) and B (mass 12.00 kg, to the right of A)
move on a frictionless, horizontal surface. Initially, block B is
moving to the left at 0.500 m/s and block A is moving to the right
at 2.00 m/s. The blocks are equipped with ideal spring bumpers. The
collision is head on, so all motion before and after it is along a
straight line. Let +x be the direction of the initial motion of
A.
Find...
Blocks A (mass 4.00 kg ) and B (mass 7.00 kg ) move on a frictionless,...
Blocks A (mass 4.00 kg ) and B (mass 7.00 kg ) move on a
frictionless, horizontal surface. Initially, block B is at rest and
block A is moving toward it at 4.00 m/s . The blocks are equipped
with ideal spring bumpers. The collision is head-on, so all motion
before and after the collision is along a straight line. Let +x be
the direction of the initial motion of block A.
Find the maximum energy stored in the spring...
Blocks A (mass 4.00 kg ) and B (mass 6.00 kg ) move on a frictionless,...
Blocks A (mass 4.00 kg ) and B (mass 6.00 kg ) move on a
frictionless, horizontal surface. Initially, block B is at rest and
block A is moving toward it at 5.00 m/s . The blocks are equipped
with ideal spring bumpers. The collision is head-on, so all motion
before and after the collision is along a straight line. Let +x be
the direction of the initial motion of block A. Find the maximum
energy stored in the spring...
Blocks A (mass 5.00 kg ) and B (mass 9.00 kg ) move on a frictionless,...
Blocks A (mass 5.00 kg ) and B (mass 9.00 kg ) move on a
frictionless, horizontal surface. Initially, block B is at rest and
block A is moving toward it at 2.00 m/s . The blocks are equipped
with ideal spring bumpers. The collision is head-on, so all motion
before and after the collision is along a straight line. Let +x be
the direction of the initial motion of block A.
a.) Find the maximum energy stored In the...
In a sample of 35 koalas, the sample mean weight was 9.41 kg, with a standard...
In a sample of 35 koalas, the sample mean weight was 9.41 kg,
with a standard deviation of 1.38 kg.
a. What must be assumed before a t confidence interval to
estimate the population mean?
b. Find and interpret a 99% confidence interval using the
koala data. You will have to use your calculator’s “TInterval” on
the “stats” setting because JMP requires the individual weights,
which are not available.
c. If a future study aims to estimate the mean koala...
A sample of size 75 will be drawn from a population with mean 35 and standard...
A sample of size 75 will be drawn from a population with mean 35
and standard deviation 10.Use the Cumulative Normal Distribution
Table if needed.
1) Find the probability that mean=x will be greater than 32.
Round the final answer to at least four decimal places.
2) Find the 65th percentile of mean=x. Round the answer to at
least two decimal places.
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