A University Wants to Know If the Average Salary of Its

question 58

Essay

A university wants to know if the average salary of its graduates has increased since 2010.The average salary of graduates prior to 2010 was $48,000.Since 2010,the university surveyed 256 graduates and found an average salary of $48,750.Assume that the standard deviation of all graduates' salaries is $7,000.
a.Specify the null and alternative hypotheses to determine whether the average salary of graduates has increased.
b.Calculate the value of the test statistic and the critical value at a 5% significance level.
c.At the 5% significance level,can you conclude that salaries have increased? Explain.

---

Definitions:

Flywheel Ring Gear

A circular gear attached to the outer edge of a flywheel, interfacing with the starter motor to begin engine rotation.

Starter Motor

Electric motor that converts electrical energy from the cranking circuit into the mechanical energy required to start the engine. Also known as cranking motor. Although not common, air-actuated starter motors are also used on trucks.

Starter Drive Assembly

A component of an engine's starting system that engages the flywheel to initiate engine rotation during startup.

Starter Relay

An electrical device that switches a large current to the starter motor, initiating the engine's operation.