Question 1 of 20
Temperatures in degrees Fahrenheit of the ocean at various depths:
A. Ratio
B. Interval
C. Ordinal
D. Nominal
Question 2 of 20
In a survey of 80 high school football players who committed to play in the Division III CCIW conference, 64 said that they would work out in their high school weight rooms in the summer before college. The margin of error for the survey was 6%. A census of all CCIW football players (not just freshmen) showed that 59% worked out at their high schools. One can conclude that:
A. the subjects were less than forthcoming in their responses to the survey.
B. the sample was not representative of the population.
C. there must have been an error in the determination of the margin of error.
D. the census results are consistent with the confidence interval of the study.
Question 3 of 20
Compared with a metric scale that has grams as the smallest division, a scale with milligrams as the smallest division:
A. will guarantee measurements that are more accurate, but not necessarily more precise.
B. will guarantee measurements that are more precise and more accurate.
C. will guarantee measurements that are more precise, but not necessarily more accurate.
D. will not guarantee measurements that are more accurate or more precise.
Question 4 of 20
Convert 13% to decimal form.
A. 0.013
B. 0.13
C. 1.3
D. 13
Question 5 of 20
Convert 5.65 to a percent.
A. 565%
B. 5.65%
C. 0.565%
D. 56.5%
Question 6 of 20
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 7 of 20
A student wanted to know the favorite lunch at a large high school with a closed campus. What is the first step in conducting a statistical study to answer the question?
A. Select a random sample of students.
B. State the goal of the study precisely.
C. Select a random sample of students and teachers.
D. Select a random sample of teachers.
Question 8 of 20
Convert 5/16 to a percent.
A. 31.25%
B. 0.3125%
C. 3.125%
D. 0.03125%
Question 9 of 20
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 the same diet without the herb. A nurse at the nutrition center weighs each subject on Friday of each week. Select the potential source of confounding.
A. The placebo effect
B. Method of assignment to treatment and control groups
C. Experimenter effect
D. The study is essentially free of confounding sources
Question 10 of 20
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 11 of 20
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 12 of 20
Which is the best fertilizer for Mr. Jimenez' backyard grass? Select the type of study most appropriate to the question.
A. Experimental
B. Experimental blinded
C. Case-controlled observational
D. Observational
Question 13 of 20
A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the sample, believed that the food was overpriced. It is estimated that 1,250,000 persons attend the Taste. Statistics suggest that, although 65% plus or minus 5% of attendees believe that the food is overpriced, the Taste is a popular event. The raw data of the study is (are)
A. 65% of the sample.
B. 700 persons, 455 persons.
C. 1,250,000 persons, 700 persons, 455 persons.
D. (60%, 70%).
Question 14 of 20
A U.S. government report stated that, "With bank interest rates around
1.0%, 8% of wage earners believe it worthwhile to keep money in a
savings account. However, at 3.0% interest, 36% of wage earners believe
it worthwhile to keep money in a savings account. The margin of error
for both studies is 4 percentage points.". A proper conclusion from the
studies is that:
A. increasing the interest rate from 1% to 3% will increase the number of
persons saving money in a savings account.
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 15 of 20
Suppose that the cost of a statistics text was $50 in 1985 and is $100 in 2000. What is the ‘Statistics Text Index' number, rounded to the nearest tenth, for the 2000 edition with the 1985 price as the reference value?
A. 20.0
B. 200.0
C. 50.0
D. 2.0
Question 16 of 20
A homeowner put a brand-name fertilizer/weed killer on half of his lawn and a generic fertilizer/weed killer on the other half. After three weeks, the generic side had 1 weed per square meter, the other side 1.7 weeds per square meter. The generic side required two mowings in the 3 weeks, the brand-name side one. The homeowner concluded that the generic was superior to the brand-name. Determine which evaluation guideline applies best in questioning the results of the described study.
A. Consider possible confounding variables.
B. Consider the sample.
C. Consider the type of study.
D. Consider the source.
Question 17 of 20
Which data provide the answer to the question: "How frequently can a student at Eureka College be expected to study more than three hours a day?"
A. Of 100 students surveyed, 43 reported that they study at least three hours a day twice a week.
B. Of 100 students surveyed, 43 reported that they have studied at least three hours a day.
C. Of 100 students surveyed, 43 reported that they studied at least three hours a day twice last week.
D. Of 100 students surveyed, 43 reported that they intend to study at least three hours a day next week.
Question 18 of 20
A sample consists of every 49th student from a group of 496 students. Identify the type of sampling used.
A. Systematic
B. Cluster
C. Convenience
D. Random
Question 19 of 20
A botany student counted 11 blades of grass in one square centimetre of
lawn and measured the lawn as a rectangle 61 m by 31 m. She reported
that there were 208,010,000 blades of grass in the lawn. The precision
of her conclusion:
A. correctly represents her measurements.
B. is less than her measurements warrant.
C. could be greater if she used a more precise calculator.
D. is excessive given her measurements.
Question 20 of 20
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.