Answered: 2. The lifetimes of two types of LEDs… | bartleby

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.3: Measures Of Spread

Problem 1GP

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2. The lifetimes of two types of LEDs were compared, two samples were
collected and the following are the results (in 1000 hours)
n
mean
Type I
st.dev.
25 56.8 4.3
Type II 18 54.6 3.6
Find a 95% confidence interval for the difference of the two means.
Using the CI, test the hypothesis that the means are equal.

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