Question 1

Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted.
378, 361, 350, 375, 200, 391, 375, 368, 321

-What is the mean?

Accepted Answer

A)  375
B)  368
C)  389.9
D)  200
E)  346.6F) B) and C)
G) B) and D)

Question 2

Twenty students were randomly selected from the most recent graduating class at a Canadian university. The number of semesters they were enrolled was calculated (mean = 9.6) 
7, 8, 10, 11, 8, 6, 10, 9, 9, 8, 13, 12, 8, 11, 11, 14, 8, 7, 10, 12

-What is the standard deviation?

Accepted Answer

A)  8
B)  2.162
C)  9.5
D)  4.674
E)  21.846F) B) and D)
G) C) and E)

Question 3

In a statistic class, 10 scores were randomly selected with the following results were obtained (mean = 71.5) :
74, 73, 77, 77, 71, 68, 65, 77, 67, 66

-What is the range?

Accepted Answer

A)  22.72
B)  12.00
C)  4.77
D)  516.20
E)  144.00F) A) and B)
G) B) and D)

Question 4

All of the following can be used to describe quantitative data with the exception of a _____.

Accepted Answer

A)  histogram
B)  stem-and-leaf display
C)  dot plot
D)  pie chart
E)  scatter plotF) B) and D)
G) All of the above

Question 5

If a frequency histogram were to be created using these data,how many classes would you create?

Accepted Answer

The answer of If a frequency histogram were to be...

Question 6

Twenty students were randomly selected from a business statistics course and were asked to report the number of times that they had eaten a meal at the university's cafeteria within the past month. Below are the values reported:
7, 8, 10, 11, 8, 6, 10, 9, 9, 8, 13, 12, 8, 11, 11, 14, 8, 7, 10, 12

-What are the inner fences?

Accepted Answer

A)  17,20
B)  3.5,15.5
C)  12.5,15.5
D)  -1,20
E)  4.5,9.0F) C) and E)
G) A) and B)

Question 7

A normal population has 99.73 percent of the population measurements within _____ standard deviations of the mean.

Accepted Answer

A)  one
B)  two
C)  three
D)  four
E)  fiveF) A) and D)
G) A) and B)

Question 8

In a rating of the satisfaction with their instructor, 13 students gave the following scores from a scale of 1 to 5:
3, 2, 1, 1, 5, 5, 4, 3, 3, 2, 4, 3, 3

-What is the median?

Accepted Answer

A)  3
B)  5
C)  2
D)  4
E)  3.25F) B) and E)
G) A) and B)

Question 9

The following table shows the annual percentage growth rate for a Stereo equipment manufacturing company between 1998 and 2002.The of the P/E ratios are also calculated and given below:

Accepted Answer

Calculat...

Question 10

The reaction time in seconds to a stop light of a group of adult men were found to be
0.74, 0.71, 0.41, 0.82, 0.74, 0.85, 0.99, 0.71, 0.57, 0.85, 0.57, 0.55

-What is the mean?

Accepted Answer

A)  0.709
B)  0.710
C)  0.920
D)  0.725
E)  0.550F) All of the above
G) A) and C)

Question 11

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. A random sample of the price of 10 computers was taken with the following results:
$3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000

-What is the mode?

Accepted Answer

A)  3447
B)  3213
C)  3250
D)  6120
E)  3445F) A) and C)
G) A) and D)

Question 12

The reaction time (in seconds)  to a stop at a red light for a group of adult men was found to be
0.74, 0.71, 0.41, 0.82, 0.74, 0.85, 0.99, 0.71, 0.57, 0.85, 0.57, 0.55

-What is the third quartile?

Accepted Answer

A)  0.752
B)  0.552
C)  0.85
D)  0.835
E)  0.57F) A) and C)
G) A) and B)

Question 13

For a bell-shaped distribution,score x would be considered an outlier if:

Accepted Answer

A)  x = 15,mean = 20,standard deviation = 3
B)  x = 15,mean = 50,standard deviation = 30
C)  x = 15,mean = 25,standard deviation = 5
D)  x = 15,mean = 10,standard deviation = 100
E)  x = 15,mean = 50,standard deviation = 10F) A) and B)
G) A) and C)

Question 14

A histogram that tails out towards smaller values is skewed _____.

Accepted Answer

negatively...

Question 15

When developing a frequency distribution,the class intervals should be ___________.

Accepted Answer

A)  large.
B)  small.
C)  different lengths.
D)  mutually exclusive.
E)  of equal length.F) B) and E)
G) C) and D)

Question 16

If there are 30 values in a data set,how many classes should be created for a frequency histogram?

Accepted Answer

A)  4
B)  5
C)  6
D)  7
E)  8F) D) and E)
G) All of the above

Question 17

In a rating of the satisfaction with their instructor, 13 students gave the following scores from a scale of 1 to 5;
3, 2, 1, 1, 5, 5, 4, 3, 3, 2, 4, 3, 3

-What are the outer fences?

Accepted Answer

A)  -1,7
B)  -4,10
C)  5,7
D)  8,10
E)  3,6F) A) and E)
G) All of the above

Question 18

A CFO is looking at the percentage of a company's resources are spent on computing.The CFO samples companies in the pharmaceutical industry and developed the following stem-and-leaf display. $$\begin{array} { l l } 
5 & 269 \
6 & 255568999 \
7 & 11224557789 \
8 & 001222458 \
9 & 02455679 \
10 & 1556 \
11 & 137 \
12 & \
13 & 255
\end{array}$$
-What is the approximate shape of the distribution of the data?

Accepted Answer

The answer of A CFO is looking at the percentage...

Question 19

The local amusement park was interested in the average wait time at their most popular roller coaster at the peak park time (2 p.m.) . They selected 13 patrons and had them get in line between 2 and 3 p.m. Each was given a stop watch to record the time they spent in line. The times recorded were as follows (in minutes) 
118, 124, 108, 116, 99, 120, 148, 118, 119, 121, 45, 130, 118

-What is the third quartile?

Accepted Answer

A)  100.8
B)  119.8
C)  128.8
D)  112
E)  121F) All of the above
G) A) and B)

Question 20

The sample mean for the above frequency table is calculated as 36.25.Calculate the (approximate)sample variance and standard deviation for this data set.

Accepted Answer

184.1493 a...

Exam 2: Descriptive Statistics

Correct Answer
verified

Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted. 378, 361, 350, 375, 200, 391, 375, 368, 321 -What is the mean?

Correct Answer
verified

In a rating of the satisfaction with their instructor, 13 students gave the following scores from a scale of 1 to 5: 3, 2, 1, 1, 5, 5, 4, 3, 3, 2, 4, 3, 3 -What is the median?

Correct Answer
verified

Correct Answer
verified

The reaction time in seconds to a stop light of a group of adult men were found to be 0.74, 0.71, 0.41, 0.82, 0.74, 0.85, 0.99, 0.71, 0.57, 0.85, 0.57, 0.55 -What is the mean?

Correct Answer
verified

Correct Answer
verified

The company financial officer was interested in the average cost of PCs that had been purchased in the past six months. A random sample of the price of 10 computers was taken with the following results: $3,250, $1,127, $2,995, $3,250, $3,445, $3,449, $1,482, $6,120, $3,009, $4,000 -What is the mode?

Correct Answer
verified

All of the following can be used to describe quantitative data with the exception of a _____.

Correct Answer
verified

A normal population has 99.73 percent of the population measurements within _____ standard deviations of the mean.

Correct Answer
verified

In a rating of the satisfaction with their instructor, 13 students gave the following scores from a scale of 1 to 5; 3, 2, 1, 1, 5, 5, 4, 3, 3, 2, 4, 3, 3 -What are the outer fences?

Correct Answer
verified

The sample mean for the above frequency table is calculated as 36.25.Calculate the (approximate)sample variance and standard deviation for this data set.

Correct Answer
verified
184.1493 a...
View Answer

Twenty students were randomly selected from the most recent graduating class at a Canadian university. The number of semesters they were enrolled was calculated (mean = 9.6) 7, 8, 10, 11, 8, 6, 10, 9, 9, 8, 13, 12, 8, 11, 11, 14, 8, 7, 10, 12 -What is the standard deviation?

Correct Answer
verified

For a bell-shaped distribution,score x would be considered an outlier if:

Correct Answer
verified

A histogram that tails out towards smaller values is skewed _____.

Correct Answer
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negatively...
View Answer

The reaction time (in seconds) to a stop at a red light for a group of adult men was found to be 0.74, 0.71, 0.41, 0.82, 0.74, 0.85, 0.99, 0.71, 0.57, 0.85, 0.57, 0.55 -What is the third quartile?

Correct Answer
verified

If there are 30 values in a data set,how many classes should be created for a frequency histogram?

Correct Answer
verified

When developing a frequency distribution,the class intervals should be ___________.

Correct Answer
verified

In a statistic class, 10 scores were randomly selected with the following results were obtained (mean = 71.5) : 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 -What is the range?

Correct Answer
verified

If a frequency histogram were to be created using these data,how many classes would you create?

Correct Answer
verified

The following table shows the annual percentage growth rate for a Stereo equipment manufacturing company between 1998 and 2002.The of the P/E ratios are also calculated and given below:

Correct Answer
verified

Calculat...
View Answer

Exam 2: Descriptive Statistics

Correct AnswerverifiedShow Answer

Quality control is an important issue at ACME Company which manufacturers light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted. 378, 361, 350, 375, 200, 391, 375, 368, 321 -What is the mean?

Correct AnswerverifiedShow Answer

In a rating of the satisfaction with their instructor, 13 students gave the following scores from a scale of 1 to 5: 3, 2, 1, 1, 5, 5, 4, 3, 3, 2, 4, 3, 3 -What is the median?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The reaction time in seconds to a stop light of a group of adult men were found to be 0.74, 0.71, 0.41, 0.82, 0.74, 0.85, 0.99, 0.71, 0.57, 0.85, 0.57, 0.55 -What is the mean?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

All of the following can be used to describe quantitative data with the exception of a _____.

Correct AnswerverifiedShow Answer

A normal population has 99.73 percent of the population measurements within _____ standard deviations of the mean.

Correct AnswerverifiedShow Answer

In a rating of the satisfaction with their instructor, 13 students gave the following scores from a scale of 1 to 5; 3, 2, 1, 1, 5, 5, 4, 3, 3, 2, 4, 3, 3 -What are the outer fences?

Correct AnswerverifiedShow Answer

The sample mean for the above frequency table is calculated as 36.25.Calculate the (approximate)sample variance and standard deviation for this data set.

Correct Answerverified184.1493 a...View AnswerShow Answer

Twenty students were randomly selected from the most recent graduating class at a Canadian university. The number of semesters they were enrolled was calculated (mean = 9.6) 7, 8, 10, 11, 8, 6, 10, 9, 9, 8, 13, 12, 8, 11, 11, 14, 8, 7, 10, 12 -What is the standard deviation?

Correct AnswerverifiedShow Answer

For a bell-shaped distribution,score x would be considered an outlier if:

Correct AnswerverifiedShow Answer

A histogram that tails out towards smaller values is skewed _____.

Correct Answerverifiednegatively...View AnswerShow Answer

The reaction time (in seconds) to a stop at a red light for a group of adult men was found to be 0.74, 0.71, 0.41, 0.82, 0.74, 0.85, 0.99, 0.71, 0.57, 0.85, 0.57, 0.55 -What is the third quartile?

Correct AnswerverifiedShow Answer

If there are 30 values in a data set,how many classes should be created for a frequency histogram?

Correct AnswerverifiedShow Answer

When developing a frequency distribution,the class intervals should be ___________.

Correct AnswerverifiedShow Answer

In a statistic class, 10 scores were randomly selected with the following results were obtained (mean = 71.5) : 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 -What is the range?

Correct AnswerverifiedShow Answer

If a frequency histogram were to be created using these data,how many classes would you create?

Correct AnswerverifiedShow Answer

The following table shows the annual percentage growth rate for a Stereo equipment manufacturing company between 1998 and 2002.The of the P/E ratios are also calculated and given below:

Correct Answerverified Calculat...View AnswerShow Answer

Correct Answer
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Correct Answer
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184.1493 a...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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negatively...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Calculat...
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