12.21 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 type and tested them. The following table lists the num- ber of hours (in thousands) that each of the bulbs in each brand lasted before being burned out. Brand I 23 Brand II 19 Brand III Brand IV 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 At the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these four brands is the same.
12.21 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 type and tested them. The following table lists the num- ber of hours (in thousands) that each of the bulbs in each brand lasted before being burned out. Brand I 23 Brand II 19 Brand III Brand IV 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 At the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these four brands is the same.
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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Transcribed Image Text:12.21 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 type and tested them. The following table lists the num-
ber of hours (in thousands) that each of the bulbs in each brand lasted before being burned out.
Brand I
23
Brand II
19
Brand III
Brand IV
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
At the 2.5% significance level, test the null hypothesis that the mean lifetime of bulbs for each of these
four brands is the same.
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