How many light bulbs should be tested if the manufacturer, Ask an Expert

Statistics

A manufacturer of a new, less expensive type of light bulb claims that this product is very well made and even more reliable than the higher priced competitive light bulbs. In order to examine the manufacturer's claim, a random sample of 50 bulbs is tested for length of life. The results are the following.

Sample Size = 50
Sample Mean = 5,200 hours
Sample Standard Deviation = 500 hours

a. Compute the 99% confidence interval for the mean life of this new type of light bulb.
b. Interpret this interval.
c. How many light bulbs should be tested, if the manufacturer wants to be 99% confident of being within 100 hours of the population mean life?

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M997830

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Amy wants to deposit money each year for the next five

Amy wants to deposit money each year for the next five years and each deposit to have $30,000 in real dollars currently and the inflation rate is 3% per year and the nominal interest rate is 9.18%. (Round off all answers ...

A laboratory worker finds that the 3 of his blood samples

A laboratory worker finds that the 3% of his blood samples test positive for the HIV virus. In a random sample of 70 blood tests, what is the mean number that test positive for the HIV virus? (Round your answer to 1 deci ...

What p-value was found when determining whether there is a

What P-value was found when determining whether there is a difference in the IQ of girls and boys in problem 6? Should you reject the null hypothesis? 1. P-Value = 0.465. Yes, you should reject the null hypothesis which ...

Smithco is a supplier to many brand name makers of mobile

SmithCo is a supplier to many brand name makers of mobile phones. SmithCo manufactures the external shells that enclose mobile phones. The strength of a shell is measured by applying increasing pressure to the shell and ...

Ye observed the following returns over timeyear

You have observed the following returns over time: Year BMG Market 1990 18% 13% 1991 4% 8% 1992 -12% 3% 1993 16% 10% 1994 18% 11% What is the beta for BMG?

Question the probability a beginning golfer makes a good

Question: The probability a beginning golfer makes a good shot if he selects the correct club is 1/3. The probability the shot is good with the wrong club is 1/5. In his bag are four different clubs, only one of which is ...

Express courier service has found that the delivery time

Express Courier Service has found that the delivery time for packages is normally distributed with mean 14 hours and standard deviation 2 hours. a. What percent of the packages will be delivered in less than 18 hours? b. ...

The distribution of heights of adult american women is

The distribution of heights of adult American women is approximately normal with a mean of 64 inches and standard deviation of 2 inches. What percent of women is taller than 68 inches?

You work for a large company with tens of thousands of

You work for a large company with tens of thousands of retail outlets throughout the world. The average sales at each retail outlet is $2,400,000 per year, with a standard deviation of $600,000. You want to put in place ...

A logging contractor has three feller bunchers on any given

A logging contractor has three feller bunchers. On any given day, each machine has a 90% chance of working. The contractor is considering buying a fourth feller buncher to offset the possibility of none of the machines o ...

4,153,160 Questions Asked
13,132 Experts
2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Recent Questions

Ask Statistics and Probability Expert