In a report by CNN Health News, the headlines read Study: Junk food raises teens' risk of heart disease.. The headlines were based on a study of 249 high school students between the ages of 13 and 18 . One researcher said, more than 80 of those tested were eating a diet that could promote heart disease.. Ultrasound was used to measure the thickness of the carotid artery, which, the researcher said, can be an early indicator of atherosclerosis, an abnormal hardening of the artery walls.. What was a potential confounding variable?
a. Thickness of carotid artery wall
b. Diet
c. Age
d. Physical activity level
Q. 2In a report by CNN Health News, the headlines read Study: Junk food raises teens' risk of heart disease.. The headlines were based on a study of 249 high school students between the ages of 13 and 18 . One researcher said, more than 80 of those tested were eating a diet that could promote heart disease.. Ultrasound was used to measure the thickness of the carotid artery, which, the researcher said, can be an early indicator of atherosclerosis, an abnormal hardening of the artery walls.. What was the explanatory variable?
a. Thickness of carotid artery wall
b. Diet
c. Age
d. Physical activity level
Q. 3In a report by CNN Health News, the headlines read Study: Junk food raises teens' risk of heart disease.. The headlines were based on a study of 249 high school students between the ages of 13 and 18 . One researcher said, more than 80 of those tested were eating a diet that could promote heart disease.. Ultrasound was used to measure the thickness of the carotid artery, which, the researcher said, can be an early indicator of atherosclerosis, an abnormal hardening of the artery walls.. What was the response variable?
a. Thickness of carotid artery wall
b. Diet
c. Age
d. Physical activity level
Q. 4In a report by CNN Health News, the headlines read Study: Junk food raises teens' risk of heart disease.. The headlines were based on a study of 249 high school students between the ages of 13 and 18 . One researcher said, more than 80 of those tested were eating a diet that could promote heart disease.. Ultrasound was used to measure the thickness of the carotid artery, which, the researcher said, can be an early indicator of atherosclerosis, an abnormal hardening of the artery walls.. What type of study was this?
a. A randomized study
b. A case-control study
c. An observational study
d. A matched-pairs designed study
Q. 5In a report by CNN Health News, the headlines read Study: Junk food raises teens' risk of heart disease.. The headlines were based on a study of 249 high school students between the ages of 13 and 18 . One researcher said, more than 80 of those tested were eating a diet that could promote heart disease.. Ultrasound was used to measure the thickness of the carotid artery, which, the researcher said, can be an early indicator of atherosclerosis, an abnormal hardening of the artery walls.. The conservative margin of error for the sample of 249 students is
a. 0.4.
b. 6.3.
c. 14.1.
d. none of the above.
Q. 6An additional group of 5 football players, not selected in the sample, asked to be included so that their opinions could be heard. Adding these students to the sample
a. is a good idea because the margin of error would decrease.
b. is a good idea because students who have a strong opinion about the issue should be represented in the sample.
c. is not a good idea because the margin of error would increase.
d. is not a good idea because the resulting sample may not be representative of all students.
Q. 7The conservative margin of error for the sample of 600 students is
a. 0.2.
b. 4.
c. 5.
d. none of the above.
Q. 8An additional group of 10 students, not selected in the sample, asked to be included so that their opinions could be heard. Adding these students to the sample
a. is a good idea because the margin of error would decrease.
b. is a good idea because students who have a strong opinion about the food should be represented in the sample.
c. is not a good idea because the margin of error would increase.
d. is not a good idea because the resulting sample may not be representative of the population of all students living in dormitories.
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