Conduct a Full Hypothesis Test and Determine If the Given

question 3

Multiple Choice

Conduct a full hypothesis test and determine if the given claim is supported or not supported at the 0.05 significance level. Round all amounts and standard scores to two decimal places.
-In 1990, the average duration of long-distance telephone calls originating in one town was 9.4 minutes. A long-distance telephone company wants to perform a hypothesis test to determine whether the average duration of long-distance phone calls has changed from the 1990 mean of 9.4 minutes. The mean duration for a random sample of 50 calls originating in the town was 8.6 minutes. Test whether the claim that the mean call duration has changed from the 1990 mean of 9.4 minutes is supported or not supported. Assume that the
Population standard deviation is 4.5 minutes.

• A)supported
• B)not supported

---

Definitions:

Break-Even Point

The production level at which total revenues equal total expenses, and the company makes neither a profit nor a loss.

Sales Mix

The combination of different products or services that a company sells, represented as percentages of total sales.

Fixed Expenses

Costs that do not fluctuate with changes in production level or sales volume, such as rent, salaries, and insurance premiums.

Product W07C

Another distinct product or model, identified by the code W07C, that is produced or offered by a company.