The Table Below Shows the Lifetimes (In Hours)of Random Samples

question 58

Essay

The table below shows the lifetimes (in hours)of random samples of light bulbs of three different brands. Use a 0.01 significance level to test the claim that the samples come from identical populations.
$$\begin{array} { r | r | r } \text { Brand A } & \text { Brand B } & \text { Brand C } \\\hline 190 & 182 & 203 \\220 & 170 & 210 \\230 & 203 & 199 \\215 & 175 & 200 \\224 & 178 & 196 \\231 & 181 & 197\end{array}$$

---

Definitions:

Profit Center

A branch or division of a company that is treated as a separate unit for the purpose of calculating its profitability.

Cost Center

A business unit or department that incurs expenses but does not directly generate revenues, often evaluated for its efficiency and cost management.

Profit Center

A segment or branch of a company that is directly responsible for generating profit through its operations and is evaluated on its profitability.

Cost Center

A business unit that incurs costs but does not directly generate revenues, often evaluated for efficiency and cost control.