Question 1 of 20

5.0 Points

Humanities majors spend an average of $115 per course on books.

Mathematics majors spend an average of $70 per course on books. What is

the percent difference between the two amounts relative to the amount

for mathematics majors (round to the nearest percent)?

A. 64%

B. 39%

C. 50%

D. 42%

Question 2 of 20

5.0 Points

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 3 of 20

5.0 Points

A college student who does laundry infrequently wants to determine the effect of bluing on what should be white clothes. Select the sample most representative of the population.

A. Reports of two friends, one of whom was given bluing

B. The reports of an internet chatroom on laundry techniques

C. Two loads of personal wash, one with, one without bluing

D.

Two loads of wash, one personal, one of a friend, the bluing assigned by

a coin flip

Question 4 of 20

5.0 Points

Convert 5/16 to a percent.

A. 31.25%

B. 0.3125%

C. 3.125%

D. 0.03125% Reset Selection

Question 5 of 20

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 Points

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 Reset Selection

Question 7 of 20

5.0 Points

Determine which of the four levels of measurement is most appropriate for the statement below.

Ages of survey respondents.

A. Ratio

B. Interval

C. Ordinal

D. Nominal

Question 8 of 20

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 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 Reset Selection

Part 1 of 1 -

Question 9 of 20

5.0 Points

A botany student counted 11 blades of grass in one square centimeter 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. Reset Selection

Question 10 of 20

5.0 Points

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 11 of 20

5.0 Points

Data has been collected from a representative sample of a well-defined population to answer the question: “How much money does the average senior male at Normal Community High School have in his pockets at the end of the school day on Friday?” The next step in the study is to:

A. determine the margin of error.

B. summarize the data with a sample statistic.

C. use the collected data to make inferences about the population.

D. summarize the data with a sample parameter. Reset Selection

Question 13 of 20

5.0 Points

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. Reset Selection

Question 14 of 20

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. Reset Selection

Question 15 of 20

5.0 Points

Compared with a stopwatch that gives readings as --. - seconds, a stopwatch that gives readings as --. - - seconds is:

A. more accurate, but not necessarily more precise.

B. more precise and more accurate.

C. not necessarily more precise or more accurate.

D. more precise, but not necessarily more accurate. Reset Selection

Question 16 of 20

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 17 of 20

5.0 Points

Temperatures in degrees Fahrenheit of the ocean at various depths:

A. Ratio

B. Interval

C. Ordinal

D. Nominal Reset Selection

Mark for Review What's This?

Question 18 of 20

5.0 Points

The size of an e-mail file is stated as 210 kB, but the file size is actually 220.5 kB. What is the absolute error?

A. 5%

B. 10%

C. 10.5 kB

D. -10.5 kB Reset Selection

Mark for Review What's This?

Question 19 of 20

5.0 Points

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. Reset Selection

Question 20 of 20

5.0 Points

Soft drink sizes: small, medium, large:

A. Qualitative, nominal

B. Quantitative, ordinal

C. Quantitative, ordinal, discrete

D. Qualitative, ordinal Reset Selection

Subject | Mathematics |

Due By (Pacific Time) | 02/26/2015 12:00 am |

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