A Large Company Buys Thousands of Lightbulbs Every Year

question 20

Essay

A large company buys thousands of lightbulbs every year. The company is currently considering four brands of lightbulbs to choose from and wants to investigate if the mean lifetimes of the 4 types of bulbs are the same. The research department randomly selected 7 bulbs of each type and test how long they lasted until they burned out. The research department then analyzed the data and obtained the following ANOVA table:

a) Fill in the blanks of the partially completed ANOVA table.
b) At test whether there are differences in the mean lifetimes of the four brands of lightbulbs.

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Definitions:

Attitude-Behavior Consistency

The correlation between a person's beliefs, feelings, and how they respond to certain ideas, objects, or other people.

Homosexual Behavior

Romantic or sexual activities or practices between individuals of the same sex.

General Attitude

An overall, enduring positive or negative feeling about some person, object, or issue.

Specific Behavior

Actions or reactions of an individual in response to external or internal stimuli.