Chapter 4 MCQ Test

1. 1Many utility companies have introduced programs to encourage energy conservation among their customers. An electric company considers placing small digital displays in households to show current electricity use and what the cost would be if this continued for a month. Will the displays reduce electricity use? One cheaper approach is to give customers a chart and information about monitoring their electricity use from their outside meter. Would this method work almost as well? The company decides to conduct an experiment to compare these two approaches [display, chart] with a group of customers who receive information about emergency consumption but no help in monitoring electricity use. 60 single-family residences volunteer to take part in this study and each resident is randomly assigned to one of the treatments.
   
   Which of the following is the explanatory variable, response variable, and experimental units (in this order)?

   1. A20 digital displays, electricity use, type of monitoring
   2. BDigital display, chart, information only
   3. CElectricity use, type of monitoring, 60 residences
   4. DType of monitoring, electricity use, 60 residences
2. 2Many utility companies have introduced programs to encourage energy conservation among their customers. An electric company considers placing small digital displays in households to show current electricity use and what the cost would be if this continued for a month. Will the displays reduce electricity use? One cheaper approach is to give customers a chart and information about monitoring their electricity use from their outside meter. Would this method work almost as well? The company decides to conduct an experiment to compare these two approaches [display, chart] with a group of customers who receive information about emergency consumption but no help in monitoring electricity use. 60 single-family residences volunteer to take part in this study and each resident is randomly assigned to one of the treatments.
   
   Why was it important to include a control group that received only information about energy consumption, but no help in monitoring electricity use?

   1. ASo there is no confounding with changes in the weather
   2. BSo the experiment could be done using a matched pair design
   3. CBecause all experiments require a control group
   4. DSo the experiment would include replication
   5. EBecause the 60 residences weren't randomly selected
3. 3Many utility companies have introduced programs to encourage energy conservation among their customers. An electric company considers placing small digital displays in households to show current electricity use and what the cost would be if this continued for a month. Will the displays reduce electricity use? One cheaper approach is to give customers a chart and information about monitoring their electricity use from their outside meter. Would this method work almost as well? The company decides to conduct an experiment to compare these two approaches [display, chart] with a group of customers who receive information about emergency consumption but no help in monitoring electricity use. 60 single-family residences volunteer to take part in this study and each resident is randomly assigned to one of the treatments.
   
   What is the purpose of randomly assigning the residences to the treatments?

   1. ATo reduce the variability in electricity use among the three groups
   2. BRandom assignment allows the company to generalize the results to all customers
   3. CTo make sure the study is double blind
   4. DTo prevent non-response among the 60 residences that volunteer
   5. ETo create groups of residences that are roughly equivalent at the beginning of the study
4. 4Many utility companies have introduced programs to encourage energy conservation among their customers. An electric company considers placing small digital displays in households to show current electricity use and what the cost would be if this continued for a month. Will the displays reduce electricity use? One cheaper approach is to give customers a chart and information about monitoring their electricity use from their outside meter. Would this method work almost as well? The company decides to conduct an experiment to compare these two approaches [display, chart] with a group of customers who receive information about emergency consumption but no help in monitoring electricity use. 60 single-family residences volunteer to take part in this study and each resident is randomly assigned to one of the treatments.
   
   An electricity company in a different city decides to conduct a similar experiment, but wants to use a blocked design. Which of the following variables would be the least useful blocking variable?

   1. AWhether or not the residence has an air conditioner
   2. BSize of the house, in square feet
   3. CNumber of people that live in the residence
   4. DColor of the residence
5. 5In a large population of books, 43% have red covers. Sally chooses an SRS of 100 books and finds that only 39 are red. Which of the following best describes why Sally didn't get exactly 43 red books?

   1. ASally's sample size was too large
   2. BSally's sample size was too small
   3. CDifferent samples from the same population will get different results
   4. DSally's sampling method must have resulted in response bias
6. 6An apartment complex is made up of 10 large buildings with 12 apartments in each building. The manager wants to select a sample of apartments to gauge interest in a proposed improvement to safety equipment at the swimming pool. If the manager selects a sample of 24 apartments by randomly selecting 2 buildings and sampling every apartment within, what kind of sample did the manager obtain?

   1. AConvenience sample
   2. BStratified random sample
   3. CSimple random sample
   4. DCluster sample
   5. EVoluntary responsive sample
7. 7To investigate if standing up while studying affects performance in an algebra class, a teacher assigns half of the 30 students who did best on the last exam and randomly assigns one to stand and one to not stand. The teacher does the same for the next two highest scoring students and continues in this manner until each student is assigned a treatment. Which of the following best describes this plan?

   1. AThis is a matched pairs design experiment
   2. BThis is a completley randomized experiment
   3. CThis is a cluster sample
   4. DThis is an observational study
   5. EThis is a stratified random sample
8. 8In the design of a survey, which of the following best explains how to minimize response bias?

   1. ARandomly select the sample
   2. BCarefully word and field-test survery questions
   3. CDecrease the sample size
   4. DIncrease the sample size
   5. EIncrease the number of questions in the survey
9. 9A researcher wishes to test a new drug developed to treat hypertension (blood pressure). A group of 40 hypertensive men volunteered to take part in the study. The researcher randomly assigns 20 men to a placebo and the rest to the treatment.
   
   If a statistically significant difference is found in this experiment, how should the researcher generalize the experiment?

   1. AThe results of the study can be generalized to all hypertensive men
   2. BThe results of the study can be generalized to the 40 hypertensive men in the study
   3. CNo casual relationship can be generalized to the 40 hypertensive men in the study
   4. DThe results of the study can be generalized to all people
   5. EThe results of the study can be generalized to all men

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AP Statistics Test sobre Chapter 4 MCQ Test, creado por Dylan Minor el 10/12/2025.

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