An Internet Service Provider (ISP) Has Randomly Selected a Sample

question 92

Multiple Choice

An internet service provider (ISP) has randomly selected a sample of 223 observations concerning values of the response variable Churn and several predictor variables based on customer activity during the most recently billed month. Here Churn equals Yes if a customer churned-left the internet service provider for another ISP-and equals No otherwise. The predictor variable MinutesOn is the average daily minutes the customer spent online. EmailSent is the average daily number of emails the customer sent from the email address provided by the ISP. ServCalls is the number of times the customer called for service. Below is part of the classification tree they derived from the data collected in the study. Of the sampled customers who spent an average of at least 511 minutes online per day and sent an average of less than 7 emails per day from their ISP-provided email address, what is the sample proportion of those who did not churn?

• A) .078
• B) .143
• C) .200
• D) .211
• E) .222

---

Definitions:

In-service Education

Training and education provided to employees while they are on duty, designed to enhance job performance and skills.

Fall Prevention

Strategies and interventions designed to reduce the risk of falls, especially in the elderly or those with mobility issues.

Specialty Certification

A formal recognition given to healthcare professionals who have met specific criteria and demonstrated advanced competency in a particular medical specialty or clinical area.

Ostomy Care

The management and maintenance of an ostomy, a surgically created opening in the body for the discharge of bodily wastes.