Question

in a recent study on the effects of sleep and test results, volunteers took a math test. the volunteers who had 8 hours of sleep were three times more likely to answer questions correctly on the math test than were sleep - deprived volunteers. complete parts a through d.
choose the correct answer below.
a. the sample is the amount of sleep the volunteers got in the study
b. the sample is the math questions in the study.
c. the sample is the test results of the volunteers in the study.
d. the sample is the sleep - deprived participants in the study.
(b) what is the samples population?
choose the correct answer below.
a. the population is the collection of all the math questions from the math test.
b. the population is the collection of all the individuals who might ever complete the math test.
c. the population is the collection of the test results of all individuals who might ever complete the math test.
(c) which part of the study represents the descriptive branch of statistics?
choose the correct answer below.
a. the statement in a recent study is an example of descriptive statistics.
b. the statement three times more likely to answer questions correctly is an example of descriptive statistics.
c. the statement 8 hours of sleep is an example of descriptive statistics.

Explanation:

(a) A sample is a subset of data collected. Here, the test results of volunteers are the data subset, so C is correct.
(b) The population is the entire set of possible data. For test - results, it's all possible test - results of individuals who could take the test, so C is correct.
(c) Descriptive statistics summarize data. The statement about being three times more likely to answer correctly summarizes the relationship between sleep and test performance, so B is correct.

Answer:

(a) C. The sample is the test results of the volunteers in the study
(b) C. The population is the collection of the test results of all individuals who might ever complete the math test
(c) B. The statement "three times more likely to answer questions correctly" is an example of descriptive statistics