Why manufacturer interested in one-sided confidence interval

Assignment Help Basic Statistics

Reference no: EM13130733

The service life of a battery used in a cardiac pacemaker is assumed to be normally distributed. A random sample of 10 batteries is subjected to an accelerated life test by running them continuously at an elevated temperature until failure, and the following lifetimes (in hours) are obtained: 25.5, 26.1, 26.8, 23.2, 24.2, 28.4, 25.0, 27.8, 27.3, and 25.7.

(a) The manufacturer wants to be certain that the mean battery life exceeds 25h. What conclusions can be drawn from these data (use alpha=.05) ?

(b) Using the data, construct a 95% lower confidence interval on mean battery life. Why would the manufacturer be interested in a one-sided confidence interval?

Reference no: EM13130733

Questions Cloud

How many grams of o2 will dissolve : The Henry's Law constant (Kh) for O2 in water at 20 degrees C is 1.28e^-3 mol/L*atm. How many grams of O2 will dissolve in 2.00L of H2O that is in contact with pure O2 at 1.00 atm?

Corporate and market beta in health service : Suppose that Apex Health Services has four different projects. These projects are listed below, along with the amount of capital invested and estimated corporate and market betas:

What is the proper amount to be reported on imperial foods : Imperial Foods checkbook balance on December 31, Year 1 was $122,400. In addition, Imperial held the following items in its safe on December 31.

Depict all possible isomers for the molecule : Draw all possible isomers for the molecule having the formula C7H7C1. The molecule contains one benzene ring.

Why manufacturer interested in one-sided confidence interval : Using the data, construct a 95% lower confidence interval on mean battery life. Why would the manufacturer be interested in a one-sided confidence interval?

What mass of substance must evaporate : What mass of this substance must evaporate in order to freeze 250 g of water initially at 15 C? (The heat of fusion of water is 334 {J/g}; the specific heat of water is 4.18 {J/g c.K}.)

Residents of metropolis tax rates : John, a resident of Metropolis, pays Metropolis an annual tax of $ 85 plus 1.6% of his annual income. If John paid $ 693 in tax, what was John income?

What effect do subsidiary treasury stock holdings : What are the advantages of acquiring the majority of the voting shares of another company rather than acquiring all of its voting stock?

Determine pension expense to be reported on the income state : Determine pension expense to be reported on the income statement for 2010. Show all computations. Round all Computations to nearest dollar.

User Account

All Pages