Probability multiple choice questions

Question 11 of 20 (correct)

Convert 5/16 to a percent.

A. 31.25%
B. 0.3125%
C. 3.125%
D. 0.03125%

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 (correct)

5.0 Points

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 14 of 20 (correct)

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 15 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

Question 16 of 20

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 17 of 20 (correct)

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.

Question 18 of 20 (correct)

5.0 Points

Temperatures in degrees Fahrenheit of the ocean at various depths:

A. Ratio
B. Interval
C. Ordinal
D. Nominal

Questions 19 0f 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 20 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.