Answered: The quality control manager at a light…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Concept explainers

Question

The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is
117 hours. A random sample of 81 light bulbs indicated a sample mean life of 370 hours. Complete parts (a) through (d) below.
a. Construct a 99% confidence interval estimate for the population mean life of light bulbs in this shipment.
The 99% confidence interval estimate is from a lower limit of 336.5 hours to an upper limit of 403.5 hours.
(Round to one decimal place as needed.)
b. Do you think that the manufacturer has the right to state that the lightbulbs have a mean life of 420 hours? Explain.

Based on the sample data, the manufacturer [does not have / has] the right to state that the lightbulbs have a mean life of 420 hours. A mean of 420 hours is [less than 2/more than 3]
standard errors [above/ below] the sample mean, so it is [likely/ highly unlikely]
that the lightbulbs have a mean life of 420 hours.

Expert Solution

Trending now

This is a popular solution!

Step by step

Solved in 4 steps with 1 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

$Point Estimation, Limit Theorems, Approximations, and Bounds$

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.

Similar questions