An Accelerated Life Test on a Large Number of Type-D

question 74

Multiple Choice

An accelerated life test on a large number of type-D alkaline batteries revealed that the mean life for a particular use before they failed is 19.0 hours. The distribution of the lives approximated a normal distribution. The standard deviation of the distribution was 1.2 hours. About 95.44% of the batteries failed between what two values?

• A)8.9 and 18.9
• B)12.2 and 14.2
• C)14.1 and 22.1
• D)16.6 and 21.4

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Definitions:

Nominal Variables

Economic variables measured in current prices, without adjusting for inflation, reflecting their value in terms of current money.

Real Variables

Economic variables that have been adjusted for inflation, allowing for the comparison of quantities over time.

Monetary Neutrality

The idea that changes in the money supply only affect nominal variables and have no long-term impact on real variables like output or employment.

Real Variables

Economic variables that have been adjusted for changes in price levels, reflecting the actual purchasing power.