A manufacturer of mechanical widgets claims that his, Ask an Expert

Statistics

A manufacturer of mechanical widgets claims that his widgets have average useful life of the 8,000 hours of continuous use before failure. An independent testing organization performs the life test on random sample of 225 of manufacturer's widgets. The sample results vary between 6000 and 9200 hours but the sample mean useful life of that sample is 6235 hours with the standard deviation of 600 hours. Using 1% significance level, test the manufacturer claim against alternative that the true mean useful life is less than 8000 hours.

View complete question

Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M917801

Have any Question?Write your Review or question?

Related Questions in Statistics and Probability

The computer systems department has 8 faculty 6 are tenured

The computer systems department has 8 faculty, 6 are tenured. A committee is formed of 3 faculty members. If members are submitted at random: - What is the probability all members of the committee are tenured? - What is ...

1i which of the following characterizes a market ordera a

1) i. Which of the following characterizes a market order? a) A market order, which is considered a small order, is when 100 shares of a stock are ordered b) A market order is when the investor specifies the maximum pric ...

You paid cash for 1300 worth of stock a year ago today the

You paid cash for $1,300 worth of stock a year ago. Today the portfolio is worth $1,888. a. What rate of return did you earn on the investment? b. Now suppose that you bought the same stock but bought it on margin. The ...

A running shoe company wants to sponsor the fastest 3 of

A running shoe company wants to sponsor the fastest 3% of runners. You know that in this race, the running times are normally distributed with a mean of 6.8 minutes and a standard deviation of 0.37 minutes. How fast woul ...

Many restaurants and eateries are now posting calorie

Many restaurants and eateries are now posting calorie counts on their menus. We wonder if providing the calories results in customers ordering fewer calories than when the calories are not provided. We will use data from ...

How could legislation impact on operations within your

How could legislation impact on operations within your organisation in relation to innovation, project management, and operational planning? Briefly outline any relevant requirements (e.g. intellectual property, WHS).

Ten students were sampled at random from a student

Ten students were sampled at random from a student population. Each was asked how many courses he or she was planning on studying in the upcoming year. The following is a list of the reported data values: 1, 2, 2, 3, 4, ...

Do you have a credit card or use some other form of

Do you have a credit card or use some other form of consumer credit? Identify what you currently use, if any. If you do not use credit, discuss a type of credit that you might consider in the future. What advantages does ...

1 coal is carried from a mine in west virginia to a power

1. Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 89 tons of coal into each car. The actual weights of coal loaded ...

Kevin knows that the beta of his portfolio is equal to 1

Kevin knows that the beta of his portfolio is equal to 1, but he does not know the risk-free rate of return or the market risk premium. He also knows that the expected return on the market is 8.25 percent. What is the ex ...

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