Journalists Are Trying to Find Out the Main Factors Used

question 2

Multiple Choice

Journalists are trying to find out the main factors used by a railway company in establishing dynamic pricing for tickets. One of the possible regression models, based on the information on 20 tickets, is ​ y = Price for a railway ticket ($) ​ x₁ = Number of days before departure ​ x₂ = Weekday (1 = Fri/Sat/Sun, 0 = Mon/Tue/Wen/Thu) ​ x₃ = Distance (km) ​ x₄ = Demand (1 to 5 scale) ​ Using the Minitab output results from fitting this model, carry out the model utility test at a 0.05 significance level. ​ ​

• A) P-value < 0.05, there appears to be a useful linear relationship between y and at least one of the three predictors.
• B) P-value < 0.05, there appears to be a useful linear relationship between y and each of the three predictors.
• C) P-value > 0.05, there is no useful linear relationship between y and any of the predictors.
• D) P-value > 0.05, there is a useful linear relationship between y and each of the three predictors.
• E) P-value > 0.05, there is no useful linear relationship between y and at least one of the predictors.

---

Definitions:

Colonoscopy

A medical examination procedure in which a long, flexible camera (colonoscope) is used to view the inner lining of the colon and rectum.

Diverticulosis

The condition of having diverticula in the colon, which are small bulges or pouches that can form in the digestive tract wall.

GI Tract

The gastrointestinal tract, an organ system responsible for transporting and digesting foodstuffs, absorbing nutrients, and expelling waste.

Mucus

A sticky, slippery substance produced by mucous membranes and glands, used to moisten, protect, and trap particles in the airways, digestive system, and other areas.