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

question 99

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 less than 511 minutes online per day and placed fewer than 3 service calls, what is the sample proportion of those who churned?

• A) .067
• B) .078
• C) .529
• D) .861
• E) .885

---

Definitions:

Quantity Supplied

The total amount of a good or service that sellers are willing and able to sell at a given price level, at a specific time.

Bushels Of Wheat

A measure of volume used chiefly in the U.S. to quantify the production or trading of wheat and other grains.

Equilibrium Price

The market price at which the quantity of goods supplied equals the quantity demanded, leading to market stability.

Quantity Supplied

The supply of goods or services that vendors are prepared and capable of offering at an established price over a specified duration.