ou want to know how phone use before bedtime affects sleep patterns. Specifically, you ask how the number of minutes a person uses their phone before sleep affects the number of hours they sleep. Which of the following statements are correct: Group of answer choicesIt is not possible to measure the dependent variable for this studyIf Subjects are first grouped by age, then phone use treatments are randomly assigned within these groups, it will comprise a randomized blockNatural variation in sleep patterns among individuals can be an extraneous variable.IV= Hours of sleep per night and DV= Minutes of phone use before sleep
Question
ou want to know how phone use before bedtime affects sleep patterns. Specifically, you ask how the number of minutes a person uses their phone before sleep affects the number of hours they sleep. Which of the following statements are correct: Group of answer choicesIt is not possible to measure the dependent variable for this studyIf Subjects are first grouped by age, then phone use treatments are randomly assigned within these groups, it will comprise a randomized blockNatural variation in sleep patterns among individuals can be an extraneous variable.IV= Hours of sleep per night and DV= Minutes of phone use before sleep
Solution
The correct statements are:
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"If Subjects are first grouped by age, then phone use treatments are randomly assigned within these groups, it will comprise a randomized block." This is correct because it describes a randomized block design, which is a method used in experiments to reduce the variability of results by grouping subjects that are similar in ways that are important to the response.
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"Natural variation in sleep patterns among individuals can be an extraneous variable." This is correct because extraneous variables are variables that are not the independent variable but could still affect the outcome of the experiment. In this case, natural variation in sleep patterns could affect the number of hours a person sleeps, regardless of their phone use.
The incorrect statements are:
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"It is not possible to measure the dependent variable for this study." This is incorrect because the dependent variable, the number of hours a person sleeps, can be measured.
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"IV= Hours of sleep per night and DV= Minutes of phone use before sleep." This is incorrect because the independent variable (IV), which is the variable that is manipulated in an experiment, is the number of minutes a person uses their phone before sleep. The dependent variable (DV), which is the variable that is measured in an experiment, is the number of hours they sleep.
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