Laboratory equipments in need of constant

Reference no: EM131001003

COMPARISON OF SPECIALTY AUXILIARY BACKUP LAB BATTERY LIFETIMES

A company that manufactures specialty batteries used as auxiliary back- ups for sensitive laboratory equipments in need of constant power sup- plies claims that its new prototype, brand A, has a longer lifetime (un- der constant use) than the industry-leading brand B, and at the same cost. Using accepted industry protocol, a series of tests carried out in an independent laboratory produced the following results: For brand A: sample size, n1 = 40; average lifetime, x¯1 = 647 hrs; with a population standard deviation given as σ1 = 27 hrs. The corresponding results for brand B are n2 = 40; x¯2 = 638; σ2 = 31. Determine, at the 5% level, if there is a signi?cant difference between the observed mean lifetimes.

Reference no: EM131001003

Questions Cloud

What is lifo liquidation profit or loss that the company : Refer to the situation described in BE 8-8. Assuming an income tax rate of 40%, what is LIFO liquidation profit or loss that the company would report in a disclosure note accompanying its financial statements?

Compute power and sample size : Use MINITAB to compute power and sample size for an upper-tailed, one sample z-test, with σ = 4, designed to detect a difference of 2, at the signi?cance level of α = 0.05: (1) if n = 25, determine the resulting power;

Explain the elements that foster effective communication : Discuss at least three (3) reasons why you perceived the communication to be effective, and explain the resulting impact to the business.

Decompose the premium payable into the risk portion : For a certain contract issued at age 60, 5V = 200, the premium payable at age 65 is 40, q65 = 0.20. Decompose the premium payable at age 65 into the risk and the savings portion.

Laboratory equipments in need of constant : A company that manufactures specialty batteries used as auxiliary back- ups for sensitive laboratory equipments in need of constant power sup- plies claims that its new prototype, brand A, has a longer lifetime (un- der constant use) than the indu..

Random samples from normal populations : Assume that the test results shown in Example 15.1 are random samples from normal populations. (1) At a signi?cance level of α = 0.05, test the hypothesis that the mean score for trainees using method A is μA = 75,

Find the initial premium of the life annuity : The interest rates are 25% per year for the first 4 years, and 50% for the fifth year. Find (a) the initial premium, (b) 1V and (c) 4V.

Calculate cost of goods sold for the february : A disclosure note reported that if FIFO had been used instead of LIFO, inventory would have been higher by $258 million and $180 million at the end of the February 28, 2009, and February 23, 2008, fiscal years, respectively.

Recommendation regarding the tested rat poison : Assuming that the "acting time" measurements are normally distributed, carry out an appropriate hypothesis test and, at the signif- icance level of α = 0.05, make an informed recommendation regarding the tested rat poison's "acting time."

User Account

All Pages