Construct a 99 confidence interval for the average length, Ask an Expert

Statistics

A new brand of laptop battery is produced by ZELCO. The company claims that the battery will last for an extended period of time before a recharge is necessary. A sample of 40 batteries is tested for the length of usage time to recharge. The sample results are as follows:

Sample Size = 40
Sample Mean = 6.5 hrs.
Sample Standard Deviation = 1.3 hrs.

a. Construct a 99% confidence interval for the average length of usage time to recharge.

b. Interpret this interval.

c. How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .25 hours?

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M9104819

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

Letnbspxbar6nbspdenote the sample mean of a

Let X(bar) 6 denote the sample mean of a sample X 1 , X 2 , ..., X 6 from Unif (-1, 3). (a) What is the expected value of X(bar) 6 ? (b) What is the variance of X(bar) 6 ?

Name some marketing techniques and styles that you have

Name some marketing techniques and styles that you have encountered that demonstrate many of the strongpoints we learned in this course.

1 a certain compact disc player randomly plays each of 10

1. A certain compact disc player randomly plays each of 10 songs on a CD. Once a song is played, it is not repeated until all the songs on the CD have been played. In how many different ways can the CD player play the 10 ...

Suppose that 20 of men p20 and 15 of women p 15 are

Suppose that 20% of men (P=.20) and 15% of women (P= .15) are carriers of a particular genetic trait. That trait can only be inherited by a child if both parents are carriers. What is the probability that a child is born ...

The december cbot treasury bond futures contract is quoted

The December CBOT Treasury bond futures contract is quoted at 92-19. If annual interest rates go up by 1.50 percentage points, what is the gain or loss on the futures contract? (Assume a $1,000 par value, and round to th ...

What are the differences between the federal deficit and

What are the differences between the Federal deficit and Federal Debt? How does a government budget deficit affect the economy, specifically the unemployment rate and job creation? Identify two periods in recent history ...

You are considering an investment in a 40-year security the

You are considering an investment in a 40-year security. The security will pay $25 a year at the end of each of the first three years. The security will then pay $30 a year at the end of each of the next 20 years. The no ...

It has been a bad day for the stock market and you have

It has been a bad day for the stock market and you have heard that only 30% of all stocks gained value. Suppose you have a portfolio of 10 securities and assume a binomial distribution for the number of your stocks that ...

What are the ways that it can help comply with legal

What are the ways that IT can help comply with legal requirements and social responsibilities surrounding the sales of alcohol?

The acme insurance company has two types of customers

The ACME Insurance Company has two types of customers, careful and reckless. A careful customer has an accident during the year with probability 0.01. A reckless customer has an accident during the year with probability ...

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