MA260 Statistical Analysis Online Exam 3 Answers (Ashworth College)
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<strong>MA260</strong> <strong>Statistical</strong> <strong>Analysis</strong> <strong>Online</strong><br />
<strong>Exam</strong> 3 <strong>Answers</strong> (<strong>Ashworth</strong> <strong>College</strong>)<br />
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<strong>MA260</strong> <strong>Statistical</strong> <strong>Analysis</strong> <strong>Online</strong> <strong>Exam</strong> 3 <strong>Answers</strong> (<strong>Ashworth</strong> <strong>College</strong>)<br />
Question 1 of 20<br />
5.0/ 5.0 Points<br />
Find the standard deviation for the given data. Round your answer to one more decimal place than the original<br />
data.<br />
22, 29, 21, 24, 27, 28, 25, 36<br />
A. 4.8 B. 4.2 C. 2.8 D. 1.6<br />
Question 2 of 20<br />
5.0/ 5.0 Points<br />
The batting averages of the first three batters in the Eureka <strong>College</strong> women’s softball team lineup are .310, .<br />
301, and .277. If the first three batters are considered as the “lead-off group”, what is the batting average of the<br />
group?<br />
A. .301 B. .296 C. There is insufficient information to answer the question<br />
D. None of the above<br />
Question 3 of 20<br />
5.0/ 5.0 Points<br />
Consider the distribution of heights of all the players in the National Basketball Association. What would you<br />
expect the shape of the distribution to be?<br />
A. Skewed right B. Skewed left C. Symmetric D. Multi-peaked<br />
Question 4 of 20<br />
5.0/ 5.0 Points<br />
The grocery expenses for six families were $80.86, $47.74, $57.92, $81.08, $75.18, and $88.08. Compute the<br />
mean grocery bill. Round your answer to the nearest cent.<br />
A. $71. 82 B. $73.79 C. $72.81 D. $71.81<br />
Question 5 of 20<br />
5.0/ 5.0 Points<br />
The number of vehicles passing through a pharmacy drive-up line with two windows during each 15-minute<br />
period was recorded. The results are shown below. Find the median number of vehicles going through the line<br />
in a fifteen-minute period.<br />
16 8 24 22 30 19 18 27 11 15
17 24 26 23 7 25 21 16 20 14<br />
A. 19.3 B. 20.1 C. 19.5 D. 19.6<br />
Question 6 of 20<br />
5.0/ 5.0 Points<br />
Consider the distribution of mathematics SAT scores of students in honors calculus at a liberal arts college.<br />
What would you expect the shape and variation of the distribution to be?<br />
A. Symmetric with little variation B. Symmetric with large variation<br />
C. Skewed right with large variation D. Skewed left with little variation<br />
Question 7 of 20<br />
5.0/ 5.0 Points<br />
A softball player has a batting average of exactly .300 and no more than<br />
60 times at bat. Suppose this player gets 5 hits in her next 6 times at<br />
bat. What is the highest possible average she could now have?<br />
A. .500 B. .833 C. .348 D. There is insufficient information to answer the question<br />
Question 8 of 20<br />
5.0/ 5.0 Points<br />
The federal government requires a car manufacturer to have a minimum miles per gallon (mpg) average over<br />
the models it makes. Suppose that the mpg’s for the five models of a manufacturer are 19, 21, 22, 28, and 18,<br />
and the government requirement is 27 mpg. The last of the models is to be redesigned to meet the government<br />
requirement. What must the new mpg of this model be to meet the requirement?<br />
A. 27 mpg B. 29 mpg C. 30 mpg D. 54 mpg<br />
Question 9 of 20<br />
5.0/ 5.0 Points<br />
The normal monthly precipitation (in inches) for August is listed for 20 different U.S. cities. Find the median of<br />
the data.<br />
A. 2.79 in. B. 3.45 in. C. 3.35 in. D. 2.45 in.<br />
Question 10 of 20<br />
0.0/ 5.0 Points This question I have completed just as the rule of finding an average by adding up all the<br />
number then dividing by the addend so try doing it by the percentage numbers instead. Most likely answer is D.<br />
The federal government requires a car manufacturer to have a minimum miles per gallon (mpg) average over<br />
the cars it makes. Suppose that the models and mpg’s for a manufacturer are Corsair (31 mpg), Futura (30<br />
mpg), Retro (37 mpg), and Envy (44 mpg). Twenty percent of the cars sold are Corsairs, 30% are Futuras,<br />
40% are Retros, and 10% are Envys. Find the average mpg for this manufacturer.<br />
A. 35.5 mpg B. 34.0 mpg C. 34.4 mpg D. None of the above<br />
Question 11 of 20<br />
5.0/ 5.0 Points<br />
Find the mode(s) for the given sample data. 20, 49, 46, 43, 49, 43, 49, 20, 22<br />
A. 43 B. 49 C. 20 D. 22<br />
Question 12 of 20<br />
5.0/ 5.0 Points<br />
The host of a dinner party purchases wine based on the weighted average of clarity (10%), bouquet (5%),<br />
friendliness to the palate (5%), storage ability of opened bottles (40%), and price (40%). Suppose that Bone<br />
Ranch Wave has scores in these categories of 4, 5, 3, 8, and 9, respectively. What is its rating?<br />
A. 5.80 B. 5.00 C. 7.60 D. None of the previous
Question 13 of 20<br />
5.0/ 5.0 Points<br />
Use the range rule of thumb to approximate the standard deviation.<br />
22,29, 21, 24, 27, 28, 25, 38<br />
A. 3.50 B. 4.0 C. 4.25 D. 2.8<br />
Question 14 of 20<br />
5.0/ 5.0 Points<br />
Find the mode(s) for the given sample data.<br />
66, 25, 66, 13, 25, 29, 56, 66<br />
A. 25 B. 56 C. 25 & 66 D. 66<br />
Question 15 of 20<br />
5.0/ 5.0 Points<br />
Al and Joe are two county sheriff’s deputies assigned to watch for traffic violations. Their arrest and conviction<br />
records for May and June are shown below.Who had the best conviction percentage in May?<br />
A. Al B. Joe C. They are equal D. Can not tell by the data available<br />
Question 16 of 20<br />
5.0/ 5.0 Points<br />
The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619,<br />
626, and 633. Suppose that the student with the score 533 drops the seminar and is replaced by a student with<br />
a score of 585. What will happen to the mean and the median scores of the class?<br />
A. Neither the mean nor the median will change.<br />
B. Both the median and the mean will increase.<br />
C. The median will increase; the mean will be unchanged.<br />
D. The mean will increase; the median will be unchanged.<br />
Question 17 of 20<br />
5.0/ 5.0 Points<br />
The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619,<br />
626, and 633. Suppose that the student with the score 533 drops the seminar and is replaced by a student with<br />
a score of 765. What will happen to the mean and the median scores of the class?<br />
A. The mean will increase; the median will be unchanged.<br />
B. The median will increase; the mean will be unchanged.<br />
C. Neither the mean nor the median will change.<br />
D. Both the median and the mean will increase.<br />
Question 18 of 20<br />
5.0/ 5.0 Points<br />
Suppose that there are 400 students in your school class. What class rank is the 20th percentile?<br />
A. 80 B. 40 C. 20 D. None of the above<br />
Question 19 of 20<br />
5.0/ 5.0 Points<br />
Find the standard deviation for the given data. Round your answer to one more decimal place than the original<br />
data.<br />
15, 42, 53, 7, 9, 12, 14, 28, 47<br />
A. 29.1 B. 16.6 C. 17.8 D. 15.8<br />
Question 20 of 20
5.0/ 5.0 Points<br />
The following data set is the GPAs of the students in a statistics class.<br />
1.93, 1.99, 2.00, 2.04, 2.12, 2.34, 2.55, 2.55, 2.75, 2.75,<br />
2.80, 2.80, 2.85, 3.02, 3.12, 3.22, 3.31, 3.33, 3.45, 3.69<br />
What percentile is a GPA of 2.34?<br />
A. About the 6th<br />
B. About the 15th<br />
C. About the 30th<br />
D. About the 60th
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