For each of the scenarios below: Step 1. Read the scenario and identify the depe
ID: 2922574 • Letter: F
Question
For each of the scenarios below:
Step 1. Read the scenario and identify the dependent variable and its type (nominal, ordinal, or continuous/equal-interval).
Step 2. Select the appropriate test for the given scenario.
Correlation
Single-sample t test
Dependent-means (dependent-samples) t test
Independent-means (independent-samples) t test
Chi-square for goodness of fit
Chi-square for independence
A recent poll with a sample of 5000 voters show that presidential candidate A has the support of 2543 of the voters while candidate B has the support of 2457 voters. Research question: Do people prefer candidate A or are people evenly split in their support? (2 points total: .5 for variable name, .5 for variable type, 1 for test)
Dependent variable:
Variable type:
Test:
A middle school is assessing the potential benefit of implementing e-readers with a large collection of electronic books in the English classroom as a replacement for the usual collection of printed books. They designate one class as the e-book group and another class as the printed book group and then assess their performance on a test of reading comprehension after a whole semester. Research question: Does the e-book group perform differently from the printed-book group? (2 points total: .5 for variable name, .5 for variable type, 1 for test)
Dependent variable:
Variable type:
Test:
A social psychologist wonders if social media usage changes from adolescence to adulthood. He collects data from a large sample of high school students on the amount of time they spend on social media and then follows up with the same students 5 years later to collect data on their social media usage. Research question: Does social media usage change from adolescence to adulthood? (2 points total: .5 for variable name, .5 for variable type, 1 for test)
Dependent variable:
Variable type:
Explanation / Answer
A recent poll with a sample of 5000 voters show that presidential candidate A has the support of 2543 of the voters while candidate B has the support of 2457 voters. Research question: Do people prefer candidate A or are people evenly split in their support? (2 points total: .5 for variable name, .5 for variable type, 1 for test)
Dependent variable: number of voters
Variable type: continous
Test: Chi square test of independence , as we want to see whther the distribution of voters for candidates is evely devided or there is a preference for one candidate over other
A middle school is assessing the potential benefit of implementing e-readers with a large collection of electronic books in the English classroom as a replacement for the usual collection of printed books. They designate one class as the e-book group and another class as the printed book group and then assess their performance on a test of reading comprehension after a whole semester. Research question: Does the e-book group perform differently from the printed-book group? (2 points total: .5 for variable name, .5 for variable type, 1 for test)
Dependent variable: the test score of reading comprehension
Variable type: Continous
Test: Independent samples t test for comaprision of mean , as both the class (groups) are independent
A social psychologist wonders if social media usage changes from adolescence to adulthood. He collects data from a large sample of high school students on the amount of time they spend on social media and then follows up with the same students 5 years later to collect data on their social media usage. Research question: Does social media usage change from adolescence to adulthood? (2 points total: .5 for variable name, .5 for variable type, 1 for test)
Dependent variable: Time spent on social media
Variable type: Continous
Test : Dependent-means (dependent-samples) t test , as the same students are followed up after 5 years
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