The Time Between Failures for an Electrical Appliance Is Exponentially

question 1

Multiple Choice

The time between failures for an electrical appliance is exponentially distributed with a mean of 25 months. What is the probability that the next failure will not occur before 30 months have elapsed?

• A) not in excess of .2
• B) in excess of .2 but not in excess of .3
• C) in excess of .3 but not in excess of .4
• D) in excess of .4 but not in excess of .6
• E) in excess of .6

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Definitions:

Two-factor ANOVA

A statistical test used to analyze the difference between group means when there are two independent variables.

Interaction

The influence that variables have on each other within a statistical model or real-world scenario.

Factorial Experiment

An experimental strategy that involves systematically varying all possible combinations of levels across multiple factors to determine their effects on a response variable.

Two-factor ANOVA

A statistical method used to analyze the effects of two independent variables on a single continuous dependent variable.