Three Different Brands of Tires Were Compared for Wear Characteristics

question 79

Essay

Three different brands of tires were compared for wear characteristics. For each brand of tire, 10 tires were randomly selected and subjected to standard wear testing procedures. The average mileage obtained for each brand of tire and sample standard deviations (both in 1000 miles) are shown below. $$\begin{array}{l}&\text { Brand } \mathrm { A } & \text { Brand } \mathrm { B } & \text { Brand } \mathrm { C } \\\text { Average mileage }&37 & 38 & 33 \\\text { Sample variance }&3 & 4 & 2\end{array}$$ Use the above data and test to see if the mean mileage for all three brands of tires is the same. Let α = .05.

---

Definitions:

Aggregate Planning

The method of creating, examining, and upkeeping an initial, rough timetable of a company's entire operations.

Decision Variables

Variables that decision-makers control to determine the best action to take in operational and planning models.

Plant Capacity

The maximum output a manufacturing facility can produce under normal operating conditions in a specific period.

Chase Strategy

A capacity management approach that involves adjusting workforce and production levels to directly match demand fluctuations.