MA260 Statistical Analysis – Online Exam Graded

5.0/ 5.0 Points

The federal government requires a car manufacturer to have a minimum miles per gallon (mpg) average over the models it makes. Suppose that the mpg’s for the five models of a manufacturer are 19, 21, 22, 28, and 18, and the government requirement is 27 mpg. The last of the models is to be redesigned to meet the government requirement. What must the new mpg of this model be to meet the requirement?

A. 27 mpg

B. 29 mpg

C. 30 mpg

D. 54 mpg

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5.0/ 5.0 Points

The mathematics SAT scores of the seven students in a mathematics seminar are 538, 550, 570, 593, 610, 622, and 634. Suppose the student with the score 634 drops the seminar and is replaced by a student with a score of 600. What will happen to the mean and the median scores of the class?

A. Neither mean nor median will change.

B. The median will decrease, the mean will not change.

C. The median will not change, the mean will decrease.

D. Both mean and median will decrease.

5.0/ 5.0 Points

Suppose that your income is at the 81st percentile of wage earners in the United States. What percent of wage earners make more than you do?

A. 19%

B. 81%

C. Cannot be calculated from the information given

D. None of the above

5.0/ 5.0 Points

The federal government requires a car manufacturer to have a minimum miles per gallon (mpg) average over the cars it makes. Suppose that the models and mpg’s for a manufacturer are Corsair (31 mpg), Futura (30 mpg), Retro (37 mpg), and Envy (44 mpg). Twenty percent of the cars sold are Corsairs, 30% are Futuras, 40% are Retros, and 10% are Envys. Find the average mpg for this manufacturer.

A. 35.5 mpg

B. 34.0 mpg

C. 34.4 mpg

D. None of the above

5.0/ 5.0 Points

The host of a dinner party purchases wine based on the weighted average of clarity (10%), bouquet (5%), friendliness to the palate (5%), storage ability of opened bottles (40%), and price (40%). Suppose that Bone Ranch Wave has scores in these categories of 4, 5, 3, 8, and 9, respectively. What is its rating?

A. 5.80

B. 5.00

C. 7.60

D. None of the previous

5.0/ 5.0 Points

Consider the distribution of mathematics SAT scores of students in honors calculus at a liberal arts college. What would you expect the shape and variation of the distribution to be?

A. Symmetric with little variation

B. Symmetric with large variation

C. Skewed right with large variation

D. Skewed left with little variation

5.0/ 5.0 Points

The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score 533 drops the seminar and is replaced by a student with a score of 765. What will happen to the mean and the median scores of the class?

A. The mean will increase; the median will be unchanged.

B. The median will increase; the mean will be unchanged.

C. Neither the mean nor the median will change.

D. Both the median and the mean will increase.

5.0/ 5.0 Points

A. 29.1

B. 28.0

C. 29.2

D. 29.0

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5.0/ 5.0 Points

Consider the distribution of heights of all the players in the National Basketball Association. What would you expect the shape of the distribution to be?

A. Skewed right

B. Skewed left

C. Symmetric

D. Multi-peaked

5.0/ 5.0 Points

Find the mode(s) for the given sample data. 7.29, 7.41, 7.56, 7.29, 7.88, 7.99, 7.62

A. 7.56

B. 7.29

C. 7.577

D. 7.41

5.0/ 5.0 Points

Al and Joe are two county sheriff’s deputies assigned to watch for traffic violations. Their arrest and conviction records for May and June are shown below.

Who had the best conviction percentage in May?

A. Al

B. Joe

C. They are equal

D. Can not tell by the data available

5.0/ 5.0 Points

A. 446.8

B. 474.6

C. 462.8

D. 464.6

5.0/ 5.0 Points

A softball player has a batting average of exactly .300 and no more than
60 times at bat. Suppose this player gets 5 hits in her next 6 times at
bat. What is the highest possible average she could now have?

A. .500

B. .833

C. .348

D. There is insufficient information to answer the question

5.0/ 5.0 Points

The following data set is the GPAs of the students in a statistics class.

1.93, 1.99, 2.00, 2.04, 2.12, 2.34, 2.55, 2.55, 2.75, 2.75,

2.80, 2.80, 2.85, 3.02, 3.12, 3.22, 3.31, 3.33, 3.45, 3.69

What percentile is a GPA of 2.34?

A. About the 6th

B. About the 15th

C. About the 30th

D. About the 60th

5.0/ 5.0 Points

The federal government requires a car manufacturer to have a minimum miles per gallon (mpg) average over the models it makes. Suppose that the average mpg for the four models manufactured is 24 mpg and the government standard is 31 mpg. The manufacturer will add a model. What mileage must the new model get so that the manufacturer meets the government requirement?

A. 32 mpg

B. 38 mpg

C. 59 mpg

D. None of the above

5.0/ 5.0 Points

A. 170.2

B. 60.6

C. 26.25

D. 18.75

5.0/ 5.0 Points

The normal monthly precipitation (in inches) for August is listed for 20 different U.S. cities. Find the median of the data.

A. 2.79 in.

B. 3.45 in.

C. 3.35 in.

D. 2.45 in.

5.0/ 5.0 Points

The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score 533 drops the seminar and is replaced by a student with a score of 585. What will happen to the mean and the median scores of the class?

A. Neither the mean nor the median will change.

B. Both the median and the mean will increase.

C. The median will increase; the mean will be unchanged.

D. The mean will increase; the median will be unchanged.

5.0/ 5.0 Points

A. 25

B. 56

C. 25 & 66

D. 66

5.0/ 5.0 Points

A. 4.8

B. 4.2

C. 2.8

D. 1.6

MA260 Statistical Analysis – Online Exam Graded