The conservative margin of error for the sample of 100 students is
a. 1.
b. 5.
c. 10.
d. none of the above.
Q. 2A random sample of 5000 students were asked whether they prefer a 10 week quarter system or a 15 week semester system. Of the 5000 students asked, 500 students responded. The results of this survey ________
a. can be generalized to the entire student body because the sampling was random.
b. can be generalized to the entire student body because the margin of error was 4.5.
c. cannot be generalized to the entire student body because the non-response rate was 90.
d. cannot be generalized to the entire student body because the margin of error was 4.5.
Q. 3A random sample of 500 students showed a statistically significant relationship between where the students usually sat in class (front, middle, or back) and grade point average (GPA). Can a conclusion that where a student sits in the classroom causes a change in GPA?
a. A cause and effect relation might be concluded because the results were statistically significant.
b. A cause and effect relation might be concluded because the study was a randomized experiment.
c. A cause and effect relation cannot be concluded because the study was an observational study.
d. A cause and effect relation cannot be concluded because seating preference was self-reported.
Q. 4A random sample of 500 students showed a statistically significant relationship between where the students usually sat in class (front, middle, or back) and grade point average (GPA). What is the explanatory variable in the study?
a. Where a student typically sits in class (front, middle, or back)
b. Grade point average (GPA)
c. Class standing (freshman, sophomore, junior, or senior)
d. Gender (Male or Female)
Q. 5A random sample of 500 students showed a statistically significant relationship between where the students usually sat in class (front, middle, or back) and grade point average (GPA). What is the response variable in the study?
a. Where a student typically sits in class (front, middle, or back)
b. Grade point average (GPA)
c. Class standing (freshman, sophomore, junior, or senior)
d. Gender (Male or Female)
Q. 6Twenty volunteers were assigned at random to one of two groups (10 people in each group). One group would take Vitamin C for two weeks, while the second group would take a placebo. At the end of the study, the proportion of colds in the two groups will be compared. Can a conclusion that taking Vitamin C causes a change in the risk of a cold?
a. A cause and effect relation might be concluded because the study had a control group.
b. A cause and effect relation might be concluded because the study was a randomized experiment.
c. A cause and effect relation cannot be concluded because the study was an observational study.
d. A cause and effect relation cannot be concluded because exposure to other people with colds was not controlled.
Q. 7Twenty volunteers were assigned at random to one of two groups (10 people in each group). One group would take Vitamin C for two weeks, while the second group would take a placebo. At the end of the study, the proportion of colds in the two groups will be compared. What is the explanatory variable in the study?
a. Getting a cold (or not)
b. Taking Vitamin C (or a Placebo)
c. Getting 8 hours of sleep a night (or not)
d. Exposure to other people with colds (or not)
Q. 8Twenty volunteers were assigned at random to one of two groups (10 people in each group). One group would take Vitamin C for two weeks, while the second group would take a placebo. At the end of the study, the proportion of colds in the two groups will be compared. What is the response variable in the study?
a. Getting a cold (or not)
b. Taking Vitamin C (or a Placebo)
c. Getting 8 hours of sleep a night (or not)
d. Exposure to other people with colds (or not)
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