Question

Arandomsampleof30GeneralElectrictransistorsresultedinanaverage lifetime of 1210 hours with a sample standard deviation of 92 hours. Compute a (a)...

Arandomsampleof30GeneralElectrictransistorsresultedinanaverage lifetime of 1210 hours with a sample standard deviation of 92 hours. Compute a
(a) 90percent (b) 95percent (c) 99percent
confidence interval estimate of the mean life of all General Electric tran-
sistors.
Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
9. The standard deviation of the lifetime of a certain type of lightbulb is known to...
9. The standard deviation of the lifetime of a certain type of lightbulb is known to equal 100 hours. A sample of 169 such bulbs had an average life of 1350 hours. Find a (a) 90percent (b) 95percent (c) 99percent confidence interval estimate of the mean life of this type of bulb.
In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard...
In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 53 hours. Find a 90% upper confidence interval for the mean lifetime. (Round the final answer to two decimal places.) The 90% upper confidence bound is ____ I got 1226.75, but it says it incorrect.
The lifetime of a certain brand of battery is known to have a standard deviation of...
The lifetime of a certain brand of battery is known to have a standard deviation of 16 hours. Suppose that a random sample of 50 such batteries has a mean lifetime of 37.6 hours. Based on this sample, find a 90% confidence interval for the true mean lifetime of all batteries of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. ( If necessary, consult...
A sample of 22 items provides a sample standard deviation of 6. (a) Compute the 90%...
A sample of 22 items provides a sample standard deviation of 6. (a) Compute the 90% confidence interval estimate of the population variance. (Round your answers to two decimal places.) ________ to _________ (b) Compute the 95% confidence interval estimate of the population variance. (Round your answers to two decimal places.) ________ to _______ (c) Compute the 95% confidence interval estimate of the population standard deviation. (Round your answers to one decimal place.) ________ to _________
If the standard deviation of the lifetime of washing machines is assumed to be 500 hours...
If the standard deviation of the lifetime of washing machines is assumed to be 500 hours of use, how large of a sample must be taken to be 90% confident that an estimate of the population Mean hours of use will have a margin of error of not more than 50 hours?
If the standard deviation of the lifetime of washing machines is assumed to be 500 hours...
If the standard deviation of the lifetime of washing machines is assumed to be 500 hours of use, how large of a sample must be taken to be 90% confident that an estimate of the population Mean hours of use will have a margin of error of not more than 50 hours?
The lifetime of a certain brand of electric light bulb is known to have a standard...
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 53 hours. Suppose that a random sample of 100 bulbs of this brand has a mean lifetime of 481 hours. Find a 99% confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult...
The lifetime of a certain brand of electric light bulb is known to have a standard...
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 51 hours. Suppose that a random sample of 150 bulbs of this brand has a mean lifetime of 481 hours. Find a 90% confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult...
A sample of 20 items provides a sample standard deviation of 5.                                
A sample of 20 items provides a sample standard deviation of 5.                                                                                      a. Compute the 90% confidence interval estimate of the population variance.                                                                                        b. Compute the 95% confidence interval estimate of the population variance.                                                                         c. Compute the 95% confidence interval estimate of the population variance.
A random sample of 16 bulb was tested to estimate the average life of this type...
A random sample of 16 bulb was tested to estimate the average life of this type of bulb under normal using conditions in a certain city. The sample mean and sample standard deviation were found to be 47500 hours and 4200 hours, respectively. a. Calculate the margin of error for a 95% confidence interval estimate of the mean lifetime of this type of bulb if used under normal using conditions. b. Find the LCL of a 90% confidence interval estimate...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT