The State Transportation Department Is Thinking of Changing Its Speed

question 135

Multiple Choice

The State Transportation Department is thinking of changing its speed limit signs. It is considering two new options in addition to the existing sign design. At question is whether the three sign designs will produce the same mean speed. To test this, the department has conducted a limited test in which a stretch of roadway was selected. With the original signs up, a random sample of 30 cars was selected and the speeds were measured. Then, on different days, the two new designs were installed, 30 cars each day were sampled, and their speeds were recorded. Suppose that the following summary statistics were computed based on the data: Based on these sample results and a significance level equal to 0.05, assuming that the null hypothesis of equal means has been rejected, the Tukey-Kramer critical range is:

• A) 1.96.
• B) approximately 4.0.
• C) Can't be determined without more information
• D) None of the above

---

Definitions:

Radioactive Implants

Small pieces of radioactive material placed within the body as part of cancer treatment to target and destroy cancerous cells.

Teletherapy

Radiation therapy administered by a machine that is positioned at some distance from the patient.

Deep Tumors

Tumors located deep within the body or organs, potentially difficult to detect, access, or treat due to their location.

Radiation Therapy

A type of cancer treatment that uses high doses of radiation to kill cancer cells and shrink tumors.