Question: (B) Find the sample size needed so that a 95% confidence will have a margin of error 3. Lifetime of electronics: In a simple random

(B) Find the sample size needed so that a 95% confidence will have a margin of error 3.

Lifetime of electronics: In a simple random sample of 100 electronic components produced by a certain method, the mean lifetime was 125 hours. Assume that component lifetimes are normally distributed with population standard deviation 6 = 20 hours. Round the critical value to no less than three decimal places. (a) Construct a 90% condence interval for the mean battery life. Round the answer to the nearest whole number. A 90% condence interval for the mean battery life is

Step by Step Solution

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock blur-text-image

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Mathematics Questions!

Allen's hummingbird ( Selasphorus sasin ) has been studied by zoologist Bill Alther. Suppose a small group of 11 Allen's hummingbirds has been under study in Arizona. The average weight for these...

1.Given that x is a normal variable with mean=49and standard deviation=6.2, find the following probabilities. (Round your answers to four decimal places.)(a) P ( x 60) (b) P ( x 50) (c) P (50 x 60)...

Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of illness such as gout, leukemia, or lymphoma.Over a period of months, an adult male...

Good Evening, I have some questions that need answers, please. 1.) Should/ Should not? Watch your cholesterol: A sample of 315 patients between the ages of 38 and 82 were given a combination of drugs...

Problem 1 : Total plasma volume is important in determining the required plasma component in blood replacement therapy for a person undergoing surgery. Plasma volume is influenced by the overall...

According to a May 2009 Harris Poll, 72% of those who drive and own cell phones say they use them to talk while they are driving. You wish to conduct a survey in your city to determine what percent...

8. [-/0.3 Points] DETAILS BBUNDERSTAT12 7.1.017.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Total plasma volume is important in determining the required plasma component in blood replacement...

Question 8 of 8 de The standard deviation of a variable is 17. If a sample of 85 individuals is selected, (a) Find the standard error of the mean. (b) Find the sample size needed to cut the standard...

1. Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Enter a number. Round your answer to four decimal places.) = 28; = 3.8 P (...

Assume thatx has a normal distribution with the specied mean and standard deviation. Find the indicated probability. (Enter a number. Round your answer to four decimal places.) ,u=8}cr=2 mm): Isabel...

QUESTION FOUR a) It has been argued for decades that monetary policy and exchange rates are more important than agricultural policy in determining farm income and its variability. Discuss. (6 mks) b)...

2. A block is projected up a frictionless inclined plane with initial speed vo-3.50 m/s. The angle of incline is 0=32.0. (a) How far up the plane does the block go? (b) How long does it take to get...

provide answers A. A liability account used to record the obligation to provide future services or return cash that has been received before services have been provided. B. Costs that result when a...

Julian Birkinshaw, James Manktelow, Vittorio DAmato, Elena Tosca, and Francesca Macchi In recent years, one of the most profound transformations in the workplace has been the increase in age...