Lube-Tech Is a Major Chain Whose Primary Business Is Performing

question 147

True/False

Lube-Tech is a major chain whose primary business is performing lube and oil changes for passenger vehicles. The national operations manager has stated in an industry newsletter that the mean number of miles between oil changes for all passenger cars exceeds 4,200 miles. To test this, an industry group has selected a random sample of 100 vehicles that have come into a lube shop and determined the number of miles since the last oil change and lube. The sample mean was 4,278 and the standard deviation was known to be 780 miles. Based on a significance level of 0.10, the critical value for the test is approximately z = 1.28.

---

Definitions:

Takt Time

The rate at which a complete product needs to be finished in order to meet customer demand.

DLP Assemblies

DLP (Digital Light Processing) assemblies refer to the components that make up a DLP projector or system, used for projecting images.

Productive Work

entails tasks or activities that directly contribute to producing goods or offering services that have economic value.

Projection Systems

Tools or methodologies utilized for forecasting future trends, demand, or outcomes based on current or historical data.