Working on confidence interval for the mean

Assignment Help Other Subject

Reference no: EM13977607

1. In a destructive test of product quality, a briefcase manufacturer places each of a simple random sample of the day's production in a viselike device and measures how many pounds it takes to crush the case. From past experience, the standard deviation has been found to be 21.5 pounds. For 35 cases randomly selected from today's production, the average breaking strength was 341.0 pounds. Construct and interpret the 99% confidence interval for the mean breaking strength of the briefcases produced today.

2. Working independently, each of two researchers has devised a sampling plan to be carried out for the purpose of constructing a 90% confidence interval for the mean of a certain population. What is the probability that neither of their confidence intervals will include the population mean?

Reference no: EM13977607

Questions Cloud

How does the global political environment shape : How does the global political environment shape foreign policy? 2. How do US foreign policies shape daily lives of Americans?3. What are the roles of the president in foreign policy decision-making?

Data represent confidence intervals for mean : The accompanying data represent one-way commuting times (minutes) for a simple random sample of 15 persons who work at a large assembly plant. The data are also in file XR09082.

Calculate percent of drivers who traveled : A Physics test consists of 40 true/false questions. Find that how many different possible answer keys can be made.

What is the expected return on the portfolio : What is the expected return on the portfolio?

Working on confidence interval for the mean : Working independently, each of two researchers has devised a sampling plan to be carried out for the purpose of constructing a 90% confidence interval for the mean of a certain population. What is the probability that neither of their confidence ..

Find magnitude and direction of the torque exerted on dipole : For an axis perpendicular to the line connecting the two charges of the dipole at its midpoint and perpendicular to the plane of the paper, find the magnitude and direction of the torque exerted on the dipole by the q2 = 9.50 μC charge.

The common stock of lester lithographic is expected to earn : What is the expected rate of return on this stock?

Percentage of defective items in the shipment : If she wishes to determine, within 1 percentage point and with 99% confidence, the percentage of defective items in the shipment, how large a simple random sample would be necessary?

What is amplitude of resulting oscillation of this system : A 10-kg box is at rest at the end of an unstretched spring with constant k=1440N/m. The mass is struck with a hammer giving it an initial velocity of 6.0m/s across a frictionless surface. The amplitude of the resulting oscillation of this system is..

User Account

All Pages