A Company Is Researching the Effectiveness of a New Website

question 9

Multiple Choice

A company is researching the effectiveness of a new website design to decrease the time to access a website. Five website users were randomly selected,and their times (in seconds) to access the website with the old and new designs were recorded. To compare the times,they computed new website design time − old website design time. The results follow. What is the alternative hypothesis?

• A)H₁: µ_d = 0
• B)H₁: µ_d ≠ 0
• C)H₁: µ_d > 0
• D)H₁: µ_d < 0

---

Definitions:

Epinephrine

Hormone secreted by the adrenal medulla in times of stress; also referred to as adrenaline.

Norepinephrine

A neurotransmitter and hormone involved in the body's fight or flight response; it affects heart rate, blood pressure, and glucose levels.

SA Node

The sinoatrial node, a group of cells located in the right atrium of the heart that generates electrical impulses initiating each heartbeat.

SA Node

The sinoatrial node, often called the heart's natural pacemaker, initiates electrical impulses that set the rate and rhythm of heartbeats.