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

question 73

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 fewer than 7 emails per day from their ISP-provided email address, what is the sample proportion of those who churned?

• A) .078
• B) .527
• C) .571
• D) .778
• E) .885

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Definitions:

Gross Investment

The sum of money used to acquire new capital assets, not considering depreciation expenses.

GDP

Gross Domestic Product, the total value of all goods and services produced within a country’s borders in a specific time period, used as a broad measure of economic performance.

Percentage Change

A mathematical calculation that shows how a quantity has changed over time as a proportion of the initial quantity, often used to measure growth or decline.

Inventory Investment

The stock of unsold goods held by a company during a given period, indicating the level of production that goes into inventories.