Suppose you are testing whether the lifetime of 4 different types of lightbulbs. You run 5 experiments each. You get a mean square error of MSE=1.75 and you reject the null hypothesis. The sample means you obtain for each lightbulb are below:  Type 1 Type 2 Type 3 Type 4 20 30 28 22 Which pairs are significantly different at the 5% significance level? Select all that apply.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Suppose you are testing whether the lifetime of 4 different types of lightbulbs. You run 5 experiments each. You get a mean square error of MSE=1.75 and you reject the null hypothesis. The sample means you obtain for each lightbulb are below: 

Type 1 Type 2 Type 3 Type 4
20 30 28 22

Which pairs are significantly different at the 5% significance level? Select all that apply. 

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