MA260 Statistical Analysis Online Exam 1 Answers (Ashworth College)

B. increasing the interest rate may well have no effect on the number of
persons saving money in a savings account.
C. increasing the interest rate will increase the number of persons saving
money in a savings account.
D. the interest rate difference between 1% and 3% may well have no effect
on the number of persons saving money in a savings account.
Question 5 of 20
5.0/ 5.0 Points
One month before a recall election, a poll of 500 Wisconsin voters showed that 46% planned to vote for the
Democratic challenger Tom Barrett and 45% planned to vote for Republican Governor Scott Walker.
Undecided voters constituted another 9%. The margin of error was 5 percentage points. What conclusion can
you draw from this poll?
A. Barrett will win the election. B. Walker can’t get over 50% of the votes.
C. The race is too close to call. D. No one will win.
Question 6 of 20
5.0/ 5.0 Points
The results of a poll are stated as follows: “Based on a survey of 156 randomly selected students, 90% of the
student body of 2870 students agree that no student should have to take final exams in two consecutive exam
periods”. If 2578 students actually agree, then what is the absolute error in the reported result?
A. 5 students B. 287 students C. 0.17% D. 292 students
Question 7 of 20
5.0/ 5.0 Points
A nutritionist wants to conduct a study to validate the efficacy of an herb as an aid in weight loss. She randomly
assigns half of a group of overweight persons to a treatment group who are given the herb with instructions for
its use and a planned diet for six weeks. The other half of the group is given parsley with the same instructions
and same diet. A nurse at the nutrition center weighs each subject on Friday of each week. Select the potential
source of confounding.
A. Placebo effect B. Experimenter effect
C. Method of assignment to treatment and control groups
D. The study is essentially free of potential confounding.
Question 8 of 20
5.0/ 5.0 Points
The father of a junior high school student wants to determine the most popular book among junior high
students. Select the sample with the least potential bias.
A. A randomly selected group of 10 book sellers
B. A randomly selected group of 30 junior high students
C. A randomly selected group of 30 junior high students leaving the public library
D. The group of 30 junior high students attending the birthday party of the
researcher’s child
Question 9 of 20
5.0/ 5.0 Points
A poll was taken of a random sample of 1189 college students. Of these
students, 789 reported that they had a drinking binge (more than 10
drinks in an evening) in the past month. Select the most believable conclusion.
A. About 66.358% of college students indulged in binge drinking last month.
B. Of the 23,456,321 college students in the country, 15,565,212 indulged
in binge drinking last month.
C. About 65% of college students indulge in binge drinking.
D. About 65% of college students indulged in binge drinking in the past month.
Question 10 of 20