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Chapter 4: Q 52. (page 253)

Internet telephone calls You can use Voice over Internet Protocol (VoIP) to make long-distance

telephone calls over the Internet. How will the cost affect the use of this service? A university plans an experiment to find out. It will offer the service to all 350 students in one of its dormitories. Some students will pay a low flat rate. Others will pay higher rates at peak periods and very low rates off-peak. The university is interested in the amount and time of use and inthe effect on the congestion of the network.

Short Answer

Expert verified

Subjects: The students in the dormitory picked.

Explanatory variable: composition of prices.

Treatments: one flat rate payable or one on / off peak rate payable.

Variables of response: quantity, time and overall network utilization.

Step by step solution

01

Given information  

The experimental units, explanatory and response variables, and treatments must all be identified.

02

Concept

The treatments are randomly assigned to all of the experimental units in a completely randomized design.

In a double-blind experiment, neither the subjects nor the persons who interact with them and evaluate their responses are aware of the therapy they received.

Observational research looks at people and assesses factors of interest without trying to affect their responses.

Individuals are purposely subjected to a treatment in order to measure their responses in an experiment.

03

Explanation

A specific disorder is referred to as a treatment for participants in a study.

The students in the dorm choose the subjects.

Price composition is an explanatory variable.

Treatments include a single flat cost or an on/off-peak rate.

Quantity, time, and total network use are the response variables.

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Most popular questions from this chapter

Do you trust the Internet? You want to ask a sample of high school students the question 鈥淗ow much do you trust information about health that you find on the Internet鈥攁 great deal, somewhat, not much, or not at all?鈥� You try out this and other questions on a pilot group of 5 students chosen from your class. The class members are listed at the top right.

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(b) Use line 107 to select the sample. Show how you use each of the digits.

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suggests the following design: Recruit 40student volunteers鈥�20male and 20female. Separate by gender, since male and female bodies might respond

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(b) Describe how you would design the experiment. Explain how your design addresses each of the problems you identified in (a).

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