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

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Definitions:

Discretionary Policy

Economic or fiscal policy based on judgment and decision-making in response to changing economic conditions, rather than set by predetermined rules.

National Saving

The total amount of savings generated within a country, including both private savings by households and public savings by the government.

Interest Rates

The cost of borrowing money or the return on investment for savings, typically expressed as a percentage of the principal amount.

Discretionary Fiscal Policy

Economic strategies implemented by the government through changes in spending levels and tax rates to influence economic conditions.