Answered: An semicon company manufactures LED…

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

Question

An semicon company manufactures LED bulbs that have a length of life that
is approximately normally distributed with a standard deviation of 2000
hours. If a sample of 35 bulbs has an average life of 45,000 hours,
a. Find a 95% confidence interval for the population mean of all bulbs
produced by this firm.
b. How large a sample is needed if we wish to be 90% confident that our
sample mean will be within 450 hours of the true mean?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

Expert Solution