Question details

A categorical variable is nominal if there is natural ordering of its possible values.
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Part 1 of 3 -

Question 1 of 20 1.0 Points
Which of the following statements are false?

A.A categorical variable is nominal if there is natural ordering of its possible values.
B.A variable is numerical if meaningful arithmetic can be performed on it.

C.Zip codes are usually treated as categorical variables, although they appear to be numerical.
D.All of the above

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Question 2 of 20 1.0 Points
Suppose that a histogram of a data set is approximately symmetric and "bell shaped". Approximately what percent of the observations are within two standard deviations of the mean?

A.99.7%

B.68%

C.50%

D.95%

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Question 3 of 20 1.0 Points
Data that arise from counts are called:

A.discrete data

B.counted data

C.continuous data
D.nominal data

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Question 4 of 20 1.0 Points
Which of the following statements is true regarding the data set 10, 10, 10, 10, and 10?

A.The range is zero

B.The standard deviation equals zero
C.The interquartile range equals zero
D.all of the above

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Question 5 of 20 1.0 Points
The average score for a class of 30 students was 75. The 20 male students in the class averaged 70. The 10 female students in the class averaged:

A.85

B.75

C.70

D.60

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Question 6 of 20 1.0 Points
Gender and State are examples of which type of data?

A.Discrete data

B.Continuous data
C.Categorical data

D.Ordinal data

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Question 7 of 20 1.0 Points
Since the population is always larger than the sample, the population mean:

A.is always larger than or equal to the sample mean

B.can be smaller than, or larger than, or equal to the sample mean
C.is always smaller than or equal to the sample mean

D.is always strictly less than the sample mean

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Question 8 of 20 1.0 Points
A scatter plot would be useful for

A.Showing the trend of sales, over time, of five different brands of blank DVDs
B.Showing the top selling brands of blank DVDs

C.Showing the relationship between the sales of blank CDs and blank DVDs

D.Showing the relative number of sales of four different brands of blank DVDs
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Question 9 of 20 1.0 Points
Which of the following are the two most commonly used measures of variability?

A.Variance and standard deviation
B.Mean and variance

C.Range and interquartile range

D.Variance and median

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Question 10 of 20 1.0 Points
Which of the following correctly describes the relationship between a sample and a population?

A.A sample is a group of subjects selected from a population to be studied.

B.A population is a group of samples that may or may not be included in a study
C.A population and a sample are not related.

D.A sample is a group of populations that are subject to observation.

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Question 11 of 20 1.0 Points
The median can also be described as:

A.the middle observation when the data values are arranged in ascending orde
B.the second quartile

C.the 50th percentile

D.all of the above

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Question 12 of 20 1.0 Points
Which of the following statistics is not a measure of central location?

A.Mean

B.Mode

C.Median

D.Interquartile range
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Part 2 of 3 -

Question 13 of 20 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

The histogram below represents scores achieved by 250 job applicants on a personality profile.


What percentage of the job applicants scored below 60? Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitimate answer.


Question 14 of 20 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

The following data represent the number of children in a sample of 10 families from Chicago: 4, 2, 1, 1, 5, 3, 0, 1, 0, and 2. 

Compute the median number of children. Place your answer, rounded to two decimal places, in the blank. For example, 3.45 would be a legitimate entry. 

Question 15 of 20 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 
A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.

Did Well in Exam Did Poorly in Exam
Studying for Exam 60 15
Went Partying 22 53


Of those in the sample who did well on the final exam, what percentage of them went partying the weekend before the exam? Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitimate answer. 

Question 16 of 20 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 
A sample of 150 students at a State University was taken after the final business statistics exam to ask them whether they went partying the weekend before the final or spent the weekend studying, and whether they did well or poorly on the final. The following table contains the result.

Did Well in Exam Did Poorly in Exam
Studying for Exam 60 15
Went Partying 22 53

Of those in the sample who went partying the weekend before the final exam, what percentage of them did well in the exam? Place your answer in the blank, rounded to 2 decimal places. Do not use a percentage sign (%). For example, 44.44 would be a legitmate answer. 

Question 17 of 20 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 
The following data are the base salaries, in thousands of dollars, of 50 chief executive officers for a sample of companies doing business with the state of Connecticut. That is, the first entry in the table below corresponds to a salary of $125,000. A copy of this data set can be found in the Excel Workbook called CEOSalaries.xls.
125 157 113 127 201
165 145 119 148 158
148 168 117 105 136
136 125 148 108 178
179 191 225 204 104
205 197 119 209 157
209 205 221 178 247
235 217 222 224 187
265 148 165 228 239
245 152 148 115 150

Find the standard deviation of the CEO salaries, in thousands of dollars, rounded to 2 decimal places. Do not use a dollar sign. Note: $177,760 should be recorded as 177.76. 

CEOSalaries.xls

Question 18 of 20 1.0 Points

Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

Suppose that an analysis of a set of test scores reveals that: .

Compute the interquartile range. Place your answer, rounded to 1 decimal place, in the blank. For example, 32.1 would be a legitimate entry. 


Part 3 of 3 -

Question 19 of 20 1.0 Points
Categorical variables can be classified as either discrete or continuous.

True

False


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Question 20 of 20 1.0 Points
Age, height, and weight are examples of numerical data.

True

False


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