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4. A large company buys thousands of lightbulbs every year. The company is currently considering four brands of lightbulbs to choose from. Before the company decides which lightbulbs to buy, it wants to investigate if the mean lifetimes of the four types of lightbulbs are the same. The company's research department randomly selected a few bulbs of each types and tested them. The following table lists the number of hours (in thousand) that each of the bulbs in each brand lasted before being burned out. Using the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these four brands is the same? Brand 1 Brand 2 Brand 3 Brand 4 23 19 23 26 24 23 27 24

4. A large company buys thousands of lightbulbs every year. The company is currently considering four brands of lightbulbs to choose from. Before the company decides which lightbulbs to buy, it wants to investigate if the mean lifetimes of the four types of lightbulbs are the same. The company's research department randomly selected a few bulbs of each types and tested them. The following table lists the number of hours (in thousand) that each of the bulbs in each brand lasted before being burned out. Using the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these four brands is the same? Brand 1 Brand 2 Brand 3 Brand 4 23 19 23 26 24 23 27 24

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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4. A large company buys thousands of lightbulbs every year. The company is currently considering four brands of lightbulbs to choose from. Before the company decides which lightbulbs to buy, it wants to investigate if the mean lifetimes of the four types of lightbulbs are the same. The company's research department randomly selected a few bulbs of each types and tested them. The following table lists the number of hours (in thousand) that each of the bulbs in each brand lasted before being burned out. Using the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these four brands is the same? Brand 1 Brand 2 Brand 3 Brand 4 23 19 23 26 24 23 27 24 19 18 25 21 26 24 26 29 22 20 23 28 23 22 21 24 25 19 27 28
Transcribed Image Text:4. A large company buys thousands of lightbulbs every year. The company is currently considering four brands of lightbulbs to choose from. Before the company decides which lightbulbs to buy, it wants to investigate if the mean lifetimes of the four types of lightbulbs are the same. The company's research department randomly selected a few bulbs of each types and tested them. The following table lists the number of hours (in thousand) that each of the bulbs in each brand lasted before being burned out. Using the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these four brands is the same? Brand 1 Brand 2 Brand 3 Brand 4 23 19 23 26 24 23 27 24 19 18 25 21 26 24 26 29 22 20 23 28 23 22 21 24 25 19 27 28
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