Question 1

SCENARIO 2-6 A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm.The following table contains the result. 
-Referring to Scenario 2-6, of those who went bar hopping the weekend before the midterm in the sample, _______ percent of them did well on the midterm.
A)15
B)27.27
C)30
D)55

Accepted Answer

The answer of SCENARIO 2-6 A sample of 200 students...

Question 2

You have collected data on the responses to two questions asked in a survey of 40 college students majoring in business-What is your gender (Male = M; Female = F)and What is your major (Accountancy = A; Computer Information Systems = C; Marketing = M). Which of the following is the best for presenting the data?
A)A contingency table.
B)A stem-and-leaf display
C)A time-series plot.
D)A Pareto chart.

Accepted Answer

A contingency table is the best way to present the data as it allows us to see the relationship between the two categorical variables (gender and major) and the frequency count in each category. This will help to identify any patterns or trends in the data. A stem-and-leaf display, time-series plot, and Pareto chart are not suitable for this type of data as they are all used for different types of data (e.g. numerical data, time-based data, categorical data with an emphasis on rankings).

Question 3

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Scenario 2-5, if 100 calls were randomly sampled, _______ of them would have lasted at least 15 minutes but less than 20 minutes
A)6
B)8
C)10
D)16

Accepted Answer

By looking at the data provided, we can see that 10 calls lasted at least 15 minutes but less than 20 minutes. To confirm this, we can count the number of data points that fall within the range of 15-20 minutes, which is inclusive of both endpoints. Since the range is 5 minutes, we can divide it by the range of the entire dataset (70-2=68) to get the proportion of data that falls within the 15-20 minute range (5/68 = 0.0735). We can then multiply this proportion by 100 to get the percentage of data that fall within the range (0.0735 x 100 = 7.35%). Finally, we can multiply this percentage by the sample size of 100 to find the expected number of calls that fall within the range (7.35 x 100 = 735). Rounding to the nearest whole number, we get 10 as the expected number of calls that lasted at least 15 minutes but less than 20 minutes. Therefore, the best choice is C)10.

Question 4

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Scenario 2-5, if 100 calls were sampled, _______ of them would have lasted less than 5 minutes or at least 30 minutes or more.
A)35
B)37
C)39
D)None of the above.

Accepted Answer

To find the number of calls that lasted less than 5 minutes or at least 30 minutes or more, we need to add the number of calls in two categories:

1. Calls that lasted less than 5 minutes 
2. Calls that lasted 30 minutes or more

From the stem, we do not have the exact numbers of calls in these two categories, but we can approximate them using the quartiles provided:

- Q1 = 6 minutes 
- Q3 = 18 minutes

We know that:

- About 25% of the calls lasted less than Q1, which is 6 minutes or less. Therefore, we can estimate that about 25% of the 100 calls or 25 calls lasted less than 5 minutes. 
- About 25% of the calls lasted more than Q3, which is 18 minutes or more. Therefore, we can estimate that about 25% of the 100 calls or 25 calls lasted at least 30 minutes or more.

To get the total number of calls that lasted less than 5 minutes or at least 30 minutes or more, we add the estimated number of calls in each category:

Total = 25 + 25 = 50

Therefore, the proportion of calls that lasted less than 5 minutes or at least 30 minutes or more is:

Proportion = Total / Sample size = 50/100 = 0.50

The answer choices are not close to this proportion except for C, which is 39. However, that is not the exact answer, but an estimate based on the quartiles provided.

Question 5

A survey of 150 executives were asked what they think is the most common mistake candidates make during job interviews.Six different mistakes were given.Which of the following is the best for presenting the information?
A)A bar chart.
B)A histogram
C)A stem-and-leaf display.
D)A contingency table.

Accepted Answer

A bar chart would be the best choice to present the information as it can easily show the frequency of each of the six different mistakes and allow for easy comparison between them. A histogram or stem-and-leaf display may also work, but they are better suited for continuous data rather than categorical data. A contingency table is not appropriate for this type of data since there is only one variable being analyzed.

Question 6

You have collected information on the market share of 5 different search engines used by U.S.Internet users in a quarter.Which of the following is the best for presenting the information?
A)A pie chart.
B)A histogram
C)A stem-and-leaf display.
D)A contingency table.

Accepted Answer

A pie chart is the best choice for presenting the market share of different search engines as it allows easy visualization of the percentage distribution of each search engine in a given quarter. It helps in comparing the market share of different search engines and identifying the dominant search engine.

Question 7

Data on the number of part-time hours students at a public university worked in a week were collected.Which of the following is the best chart for presenting the information?
A)A pie chart.
B)A Pareto chart.
C)A percentage table.
D)A percentage polygon.

Accepted Answer

A percentage polygon can effectively display the distribution of part-time hours worked by students in a week, allowing for easy comparison of the frequency of different working hour intervals.

Question 8

Data on the number of credit hours of 20,000 students at a public university enrolled in a Spring semester were collected.Which of the following is the best for presenting the information?
A)A pie chart.
B)A Pareto chart.
C)A stem-and-leaf display.
D)A contingency table.

Accepted Answer

A stem-and-leaf display is the best choice for presenting the number of credit hours of 20,000 students because it allows for the data to be easily organized and displayed numerically. A pie chart and Pareto chart would not work well because there are too many possible values for the number of credit hours, making it difficult to display in a meaningful way. A contingency table is also not appropriate because there is only one variable being measured.

Question 9

You have collected information on the consumption by the 15 largest coffee-consuming nations.Which of the following is the best for presenting the shares of the consumption?
A)A pie chart.
B)A Pareto chart
C)A side-by-side bar chart.
D)A contingency table.

Accepted Answer

The answer of You have collected information on the consumption...

Question 10

One of the developing countries is experiencing a baby boom, with the number of births rising for the fifth year in a row, according to a BBC News report.Which of the following is best for displaying this data?
A)A Pareto chart
B)A two-way classification table
C)A histogram
D)A time-series plot

Accepted Answer

A time-series plot is the best choice for displaying this data because it shows changes in the number of births over time, which is the key feature of this situation. A Pareto chart would be more suitable for displaying the frequency of different causes, a two-way classification table is better for comparing two variables, and a histogram would be more appropriate for displaying the distribution of a single variable.

Question 11

Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive?
A)A Pareto chart
B)A two-way classification table
C)A histogram
D)A scatter plot

Accepted Answer

The answer of Which of the following is appropriate for...

Question 12

You have collected data on the approximate retail price (in $)and the energy cost per year (in $)of 15 refrigerators.Which of the following is the best for presenting the data?
A)A pie chart.
B)A scatter plot
C)A side-by-side bar chart.
D)A contingency table.

Accepted Answer

A scatter plot is the best way to visually display the relationship between two continuous variables, such as the approximate retail price and energy cost per year of refrigerators. It allows for easy identification of any patterns or trends in the data and helps to determine if there is a correlation between the two variables. A pie chart, side-by-side bar chart, and contingency table are more suited for displaying categorical data.

Question 13

You have collected data on the number of complaints for 6 different brands of automobiles sold in the US over a 10-year period.Which of the following is the best for presenting the data?
A)A contingency table.
B)A stem-and-leaf display
C)A time-series plot.
D)A side-by-side bar chart.

Accepted Answer

The answer of You have collected data on the number...

Question 14

Data on 1,500 students' height were collected at a larger university in the East Coast. Which of the following is the best chart for presenting the information?
A)A pie chart.
B)A Pareto chart.
C)A side-by-side bar chart.
D)A histogram.

Accepted Answer

Since we are dealing with continuous numerical data, the best chart for presenting the information would be a histogram. A histogram displays the distribution of data in intervals, providing a clear visual of the frequency of the data.

Question 15

When studying the simultaneous responses to two categorical questions, you should set up a
A)contingency table.
B)frequency distribution table.
C)cumulative percentage distribution table.
D)histogram.

Accepted Answer

A contingency table is the best choice for studying the simultaneous responses to two categorical questions. It allows for the analysis of the relationship between the two variables by showing the frequency or proportion of observations in each combination of values.

Question 16

You have collected data on the monthly seasonally adjusted civilian unemployment rate for the United States over a 10-year period.Which of the following is the best for presenting the data?
A)A contingency table.
B)A stem-and-leaf display
C)A time-series plot.
D)A side-by-side bar chart.

Accepted Answer

The best choice for presenting the data on the monthly seasonally adjusted civilian unemployment rate for the United States over a 10-year period would be a time-series plot as it effectively shows the change in the unemployment rate over time. With a time-series plot, the x-axis can represent the time period while the y-axis can represent the unemployment rate. This allows for trends, patterns, and changes over time to be easily visualized and interpreted. A contingency table would not be effective as it is best used for analyzing categorical data. A stem-and-leaf display and side-by-side bar chart may not effectively illustrate the changes over time.

Question 17

SCENARIO 2-6 A sample of 200 students at a Big-Ten university was taken after the midterm to ask them whether they went bar hopping the weekend before the midterm or spent the weekend studying, and whether they did well or poorly on the midterm.The following table contains the result. 
-Referring to Scenario 2-6, of those who did well on the midterm in the sample, _______ percent of them went bar hopping the weekend before the midterm.
A)15
B)27.27
C)30
D)50

Accepted Answer

To find the percentage of students who did well on the midterm and went bar hopping the weekend before, we need to look at the intersection of those two categories. From the table, we can see that 6 students did well on the midterm and went bar hopping. To find the percentage, we divide 6 by the total number of students who did well (25) and multiply by 100. This gives us 24%, which rounds up to 27.27% when expressed as a percentage with two decimal places. Therefore, the correct answer is B.

Question 18

You have collected data on the number of U.S.households actively using online banking and/or online bill payment over a 10-year period.Which of the following is the best for presenting the data?
A)A pie chart.
B)A stem-and-leaf display
C)A side-by-side bar chart.
D)A time-series plot.

Accepted Answer

Since the collected data is over a 10-year period, a time-series plot would be the best choice for presenting this data. A time-series plot shows changes in a variable over time and will allow for trends and patterns to be easily identified. This is important for analyzing usage of online banking and bill payment over time, as there may be fluctuations or clear increases/decreases in usage that need to be examined. A pie chart would not be appropriate in this case as it is not conducive to displaying changes over time. A stem-and-leaf display would be suitable for displaying small amounts of data but it may not be suitable for displaying trends over 10 years. A side-by-side bar chart may be appropriate for comparing multiple variables at a single point in time, but it may not capture the changes in usage over 10 years.

Question 19

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Scenario 2-5, if 100 calls were sampled, _______ of them would have lasted less than 15 minutes.
A)26
B)74
C)10
D)None of the above.

Accepted Answer

To find the percentage of calls that lasted less than 15 minutes, we need to count the number of calls with a duration of less than 15 minutes and divide by the total number of calls (100). From the data provided, we can see that 26 calls lasted less than 15 minutes (7+3+6+10), so the percentage is 26/100 = 0.26 or 26%. Therefore, the best choice is B, which represents 74 calls (100-26) that lasted 15 minutes or more.

Question 20

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. 
-Referring to Scenario 2-5, if 100 calls were sampled, _______of them would have lasted 20 minutes or more.
A)26
B)16
C)74
D)None of the above.

Accepted Answer

The answer of SCENARIO 2-5 The following are the duration...

Quiz 2: Organizing and Visualizing Variables

A survey of 150 executives were asked what they think is the most common mistake candidates make during job interviews.Six different mistakes were given.Which of the following is the best for presenting the information?

You have collected information on the market share of 5 different search engines used by U.S.Internet users in a quarter.Which of the following is the best for presenting the information?

Data on the number of part-time hours students at a public university worked in a week were collected.Which of the following is the best chart for presenting the information?

Data on the number of credit hours of 20,000 students at a public university enrolled in a Spring semester were collected.Which of the following is the best for presenting the information?

You have collected information on the consumption by the 15 largest coffee-consuming nations.Which of the following is the best for presenting the shares of the consumption?

One of the developing countries is experiencing a baby boom, with the number of births rising for the fifth year in a row, according to a BBC News report.Which of the following is best for displaying this data?

Which of the following is appropriate for displaying data collected on the different brands of cars students at a major university drive?

You have collected data on the approximate retail price (in $) and the energy cost per year (in $) of 15 refrigerators.Which of the following is the best for presenting the data?

You have collected data on the number of complaints for 6 different brands of automobiles sold in the US over a 10-year period.Which of the following is the best for presenting the data?

Data on 1,500 students' height were collected at a larger university in the East Coast. Which of the following is the best chart for presenting the information?

When studying the simultaneous responses to two categorical questions, you should set up a

You have collected data on the monthly seasonally adjusted civilian unemployment rate for the United States over a 10-year period.Which of the following is the best for presenting the data?

You have collected data on the number of U.S.households actively using online banking and/or online bill payment over a 10-year period.Which of the following is the best for presenting the data?

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. -Referring to Scenario 2-5, if 100 calls were sampled, _______ of them would have lasted less than 15 minutes.

SCENARIO 2-5 The following are the duration in minutes of a sample of long-distance phone calls made within the continental United States reported by one long-distance carrier. -Referring to Scenario 2-5, if 100 calls were sampled, _______of them would have lasted 20 minutes or more.