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

Expert Solution

orchestra answered 2 years ago
Next > < Previous

Related 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.
ADVERTISEMENT
Subjects
ADVERTISEMENT
Latest Questions
ADVERTISEMENT