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Ashworth MA260 Exam 3 Answers / Statistical Analysis I

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MA260 Statistical Analysis Online Exam 3 Answers (Ashworth College)

Question 1 of 20

5.0/ 5.0 Points

Find the standard deviation for the given data. Round your answer to one more decimal place than the original data.

22, 29, 21, 24, 27, 28, 25, 36

 

A. 4.8       B. 4.2         C. 2.8           D. 1.6

 

Question 2 of 20

5.0/ 5.0 Points

The batting averages of the first three batters in the Eureka College women’s softball team lineup are .310, .301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the group?

 

A. .301    B. .296     C. There is insufficient information to answer the question

D. None of the above

 

Question 3 of 20

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

 

Question 4 of 20

5.0/ 5.0 Points

The grocery expenses for six families were $80.86, $47.74, $57.92, $81.08, $75.18, and $88.08. Compute the mean grocery bill. Round your answer to the nearest cent.

 

A. $71. 82 B. $73.79 C. $72.81 D. $71.81

 

Question 5 of 20

5.0/ 5.0 Points

The number of vehicles passing through a pharmacy drive-up line with two windows during each 15-minute period was recorded. The results are shown below. Find the median number of vehicles going through the line in a fifteen-minute period.

16 8 24 22 30 19 18 27 11 15
17 24 26 23 7 25 21 16 20 14

 

A. 19.3      B. 20.1           C. 19.5        D. 19.6

 

Question 6 of 20

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

 

Question 7 of 20

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

 

 

 

 

 

Question 8 of 20

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

 

Question 9 of 20

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.

 

Question 10 of 20

0.0/ 5.0 Points This question I have completed just as the rule of finding an average by adding up all the number then dividing by the addend so try doing it by the percentage numbers instead. Most likely answer is D.

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

 

Question 11 of 20

5.0/ 5.0 Points

Find the mode(s) for the given sample data. 20, 49, 46, 43, 49, 43, 49, 20, 22

 

A. 43        B. 49           C. 20        D. 22

 

 

Question 12 of 20

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

 

Question 13 of 20

5.0/ 5.0 Points

Use the range rule of thumb to approximate the standard deviation. 

22,29, 21, 24, 27, 28, 25, 38

 

A. 3.50          B. 4.0          C. 4.25           D. 2.8

 

Question 14 of 20

5.0/ 5.0 Points

Find the mode(s) for the given sample data. 

66, 25, 66, 13, 25, 29, 56, 66

 

A. 25         B. 56            C. 25 & 66            D. 66

 

Question 15 of 20

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

 

 

Question 16 of 20

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.

 

Question 17 of 20

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.

 

Question 18 of 20

5.0/ 5.0 Points

Suppose that there are 400 students in your school class. What class rank is the 20th percentile?

 

A. 80 B.          40             C. 20            D. None of the above

 

 

 

Question 19 of 20

5.0/ 5.0 Points

Find the standard deviation for the given data. Round your answer to one more decimal place than the original data.

15, 42, 53, 7, 9, 12, 14, 28, 47

 

A. 29.1            B. 16.6             C. 17.8            D. 15.8

 

Question 20 of 20

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

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