Question

The distribution of the operating life for batteries produced by a manufacturer is approximately normal with...

The distribution of the operating life for batteries produced by a manufacturer is approximately normal with standard deviation 3 hours. A random sample of 19 batteries has a mean operating life of 20 hours. (a) Find a 90% conÖdence interval for the for the true mean life of the battery. (b) Find the minimum number of batteries that should be sampled so that the length of the 90% conÖdence interval will not exceed 0.5.

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
The distribution of the operating life for batteries produced by a manufacturer is approximately normal with...
The distribution of the operating life for batteries produced by a manufacturer is approximately normal with standard deviation 3 hours. A random sample of 19 batteries has a mean operating life of 20 hours. (a) Find a 90% conÖdence interval for the for the true mean life of the battery. (b) Find the minimum number of batteries that should be sampled so that the length of the 90% conÖdence interval will not exceed 0.5.
Suppose the life of a particular brand of calculator battery is approximately normally distributed with a...
Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 85 hours and a standard deviation of 11 hours. Complete parts a through c. a. What is the probability that a single battery randomly selected from the population will have a life between 80 and 90​ hours? ​P(80≤ overbar x≤90​)= ​(Round to four decimal places as​ needed.) b. What is the probability that 4 randomly sampled batteries from the population will have...
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation...
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 21 AAA batteries produced by this manufacturer lasted a mean of 11 hours with a standard deviation of 1.7 hours. Find a 95% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below. Carry your intermediate computations to at...
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation...
Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 28 AAA batteries produced by this manufacturer lasted a mean of 9.1 hours with a standard deviation of 2.2 hours. Find a 95% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below. Carry your intermediate computations to at...
estion Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard...
estion Lifetimes of AAA batteries are approximately normally distributed. A manufacturer wants to estimate the standard deviation of the lifetime of the AAA batteries it produces. A random sample of 17 AAA batteries produced by this manufacturer lasted a mean of 9.4 hours with a standard deviation of 2.2 hours. Find a 99% confidence interval for the population standard deviation of the lifetimes of AAA batteries produced by the manufacturer. Then complete the table below. Carry your intermediate computations to...
The life in hours of a battery is known to be approximately normally distributed with standard...
The life in hours of a battery is known to be approximately normally distributed with standard deviation σ = 1.5 hours. A random sample of 10 batteries has a mean life of ¯x = 50.5 hours. You want to test H0 : µ = 50 versus Ha : µ 6= 50. (a) Find the test statistic and P-value. (b) Can we reject the null hypothesis at the level α = 0.05? (c) Compute a two-sided 95% confidence interval for the...
Suppose the life of a particular brand of calculator battery is approximately normally distributed with a...
Suppose the life of a particular brand of calculator battery is approximately normally distributed with a mean of 80 hours and a standard deviation of 11 hours. Complete parts a through c. a. What is the probability that a single battery randomly selected from the population will have a life between and hours? 75 85 P(75 ≤ x ≤ 85) = (Round to four decimal places as needed.) b. What is the probability that randomly sampled batteries from the population...
the mean life of a name brand aa battery is 19 hours. a consumer group is...
the mean life of a name brand aa battery is 19 hours. a consumer group is interested in determining if generic aa batteries have a shorter mean life. this group tested a random sample of 9 generic AA batteries resulting in a mean life of 17.4 hours with a standard deviation of 1.5 hours. you may assume that battery lives follow a normal distribution. At 1% level of significance, do the generic AA batteries have a mean life shorter than...
A battery manufacturer claims that the batteries used in their electronic games will last an average...
A battery manufacturer claims that the batteries used in their electronic games will last an average of 36 hours. To certify this average, 12 batteries are tested each month. Calculate the t-value for a sample of 12 batteries that has a sample mean of 32.5 hours and a sample standard deviation of 5 hours. Assume the distribution of battery lives to be approximately normal, i.e. rules of symmetry apply. Round answer to 4 significant figures in the format: -1.234 The...
The life of a particular battery is known to follow a normal distribution , with a...
The life of a particular battery is known to follow a normal distribution , with a mean of 1264 hours and a standard deviation of 116 hours. a. What percent of batteries last less than 1511 hours? 0.98341425 b. The 95 th percentile is represented by what number of hours of battery life? c. What is the probability that a randomly selected battery will last more than 1154 hours? 0.17156471 Incorrect
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT