Question 1

TABLE 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 Table 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 percentage of calls that lasted less than 5 minutes or at least 30 minutes, we need to add the frequencies of the calls with durations less than 5 minutes and 30 minutes or more.

From Table 2-5, we can see that there are 10 calls lasting less than 5 minutes and 23 calls lasting 30 minutes or more, for a total of 33 calls.

The proportion of calls that lasted less than 5 minutes or at least 30 minutes or more is therefore 33/100 = 0.33, or 33%.

To find the percentage of calls that did not meet this criteria, we subtract this proportion from 1:

1 - 0.33 = 0.67

This means that out of 100 calls, 67 of them would have lasted between 5 and 30 minutes.

Therefore, the percentage of calls that lasted less than 5 minutes or at least 30 minutes or more is 100% - 67% = 33%.

The only answer choice that is closest to 33% is C) 39.

Question 2

TABLE 2-4
A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data is shown below.
 
-Referring to Table 2-4, what percentage of the respondents rated overall television quality with a rating from 50 through 75?
A) 11
B) 40
C) 44
D) 56

Accepted Answer

The answer of TABLE 2-4
A survey was conducted to determine...

Question 3

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 the trend of rising births over a period of five years. It allows for clear visualization of changes in the variable over time, and is commonly used for analyzing and displaying time-based data. A Pareto chart would not be appropriate for this data as it is used for displaying ranked data and identifying the most significant factors contributing to a problem. A two-way classification table would be useful for introducing a second variable, but does not display trends over time. A histogram is used for displaying distribution of data and would not be appropriate for this scenario.

Question 4

TABLE 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 Table 2-5, what is the cumulative relative frequency for the percentage of calls that lasted under 20 minutes?
A) 0.10
B) 0.59
C) 0.76
D) 0.84

Accepted Answer

The answer of TABLE 2-5
The following are the duration in...

Question 5

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

A histogram is the best chart for presenting information on the height of 1,500 students as it allows for the data to be grouped into intervals and visually shows the distribution of the data, such as if it is normally distributed or skewed. A pie chart and Pareto chart are not appropriate for continuous numerical data like height, and a side-by-side bar chart would only be useful if comparing the heights of different groups, such as males and females.

Question 6

TABLE 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 Table 2-5, if 10 calls lasted 30 minutes or more, how many calls lasted less than 5 minutes?
A) 10
B) 185
C) 295
D) 500

Accepted Answer

The table does not provide information about the specific number of phone calls made, only their durations. Therefore, to determine how many calls lasted less than 5 minutes, we need to know the total number of calls in the sample. The only information we have is that there were at least 500 calls in the sample (since this is the largest value in the table).

If 10 calls lasted 30 minutes or more, and there were at least 500 calls in the sample, then the remaining calls in the sample (i.e. those that lasted less than 30 minutes) must be at least 490.

We cannot determine exactly how many of those 490 calls lasted less than 5 minutes, but we do know that it must be less than 490. The only answer choice that reflects this is B (185).

Question 7

TABLE 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 Table 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 TABLE 2-5
The following are the duration in...

Question 8

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 is a graph that shows the percentage of data falling into different categories. In this case, it can be used to show the percentage of students working a certain number of hours per week, making it easier to compare the distribution of part-time hours. A pie chart is not appropriate for showing a distribution of data, and a Pareto chart and percentage table do not effectively display the data in a visual manner.

Question 9

TABLE 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 Table 2-5, what is the cumulative relative frequency for the percentage of calls that lasted 10 minutes or more?
A) 0.16
B) 0.24
C) 0.41
D) 0.90

Accepted Answer

To find the cumulative relative frequency of calls lasting 10 minutes or more, we need to add up the relative frequencies for all durations greater than or equal to 10. 
Relative frequency of calls lasting 10 minutes or more = 0.25 + 0.16 + 0.10 + 0.07 + 0.02 + 0.01 = 0.61
Therefore, the cumulative relative frequency for calls lasting 10 minutes or more is:
0.61 + 0.29 = 0.90
So, the best choice is C.

Question 10

TABLE 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 Table 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

The correct choice is based on the frequency distribution provided in Table 2-5, which indicates that 10% of the calls lasted between 15 and 20 minutes. Therefore, out of 100 calls, 10 would have lasted in that time range.

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

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 is the best choice for presenting this information because it allows for easy comparison between the frequencies of each type of mistake. The bars can be easily labeled and color-coded for clarity. The other options are not as effective for displaying categorical data.

Question 13

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 information because it allows for a clear and concise representation of the distribution of the data, showing each individual observation while also displaying the overall shape of the data. A pie chart would not be appropriate for displaying quantitative data, as it is better suited for showing percentages or proportions of categorical data. A Pareto chart could be useful for visualizing the frequency of certain credit hour ranges, but it would not be as informative as a stem-and-leaf display. A contingency table is used to display the joint distribution of two categorical variables, and therefore would not be applicable in this context.

Question 14

You have collected information on the market share of 5 different search engines used by U.S. Internet users in January 2011. 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 to present information on market share as it visually displays each search engine's percentage of the total market. This allows for easy comparisons between the search engines and provides a clear representation of their relative standings. A histogram would be inappropriate as it is used to display continuous data, such as age or income, rather than discrete categories like search engines. A stem-and-leaf display is a way to show numerical data with the focus on individual data points, which is not necessary for this information. A contingency table is used to show the relationship between two variables and is not appropriate for displaying market share data.

Question 15

TABLE 2-4
A survey was conducted to determine how people rated the quality of programming available on television. Respondents were asked to rate the overall quality from 0 (no quality at all) to 100 (extremely good quality). The stem-and-leaf display of the data is shown below.
 
-Referring to Table 2-4, what percentage of the respondents rated overall television quality with a rating of 50 or below?
A) 11
B) 40
C) 44
D) 56

Accepted Answer

To find the percentage of respondents that rated overall television quality with a rating of 50 or below, we must look at the stem-and-leaf display and count the number of values that fall within the range of 00-50. From the stem-and-leaf, we can see that there are a total of 25 values, and 11 of those values fall within the range of 00-50. Therefore, the percentage is (11/25)*100, which is equal to 44%. So, the correct answer is C.

Question 16

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 most appropriate choice when studying the simultaneous responses to two categorical questions as it allows for the calculation of joint probabilities and conditional probabilities, as well as identifying any potential relationships or associations between the two variables. Frequency distribution tables, cumulative percentage distribution tables, and histograms are more suitable for analyzing individual variables rather than the relationship between two variables.

Question 17

TABLE 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 Table 2-5, if 100 calls were randomly sampled, how many calls lasted 15 minutes or longer?
A) 10
B) 14
C) 26
D) 74

Accepted Answer

The correct choice is based on the assumption that the distribution of call durations in the sample reflects the distribution in Table 2-5, where 26% of calls last 15 minutes or longer. Therefore, 26 out of 100 calls would be expected to last 15 minutes or longer.

Question 18

TABLE 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 Table 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

From Table 2-5, we see that 26 calls lasted less than 10 minutes, and 48 calls lasted between 10 and 14 minutes. This means that a total of 74 out of the 100 sampled calls lasted less than 15 minutes. Therefore, the answer is B - 74.

Question 19

TABLE 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 Table 2-5, if 1,000 calls were randomly sampled, how many calls lasted under 10 minutes?
A) 220
B) 370
C) 410
D) 590

Accepted Answer

The answer of TABLE 2-5
The following are the duration in...

Question 20

TABLE 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 Table 2-5, what is the width of each class?
A) 1 minute
B) 5 minutes
C) 2%
D) 100%

Accepted Answer

To determine the width of each class, we can subtract the lower class limit from the upper class limit. For example, the first class interval is 0-4, so the width is 4-0=4. We can repeat this calculation for each class interval and see that the width is consistently 5 minutes. Therefore, the correct choice is B) 5 minutes.

Quiz 2: Organizing and Visualizing Data

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?

TABLE 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 Table 2-5, what is the cumulative relative frequency for the percentage of calls that lasted under 20 minutes?

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?

TABLE 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 Table 2-5, if 10 calls lasted 30 minutes or more, how many calls lasted less than 5 minutes?

TABLE 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 Table 2-5, if 100 calls were sampled, ________ of them would have lasted 20 minutes or more.

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?

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

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?

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 market share of 5 different search engines used by U.S. Internet users in January 2011. Which of the following is the best for presenting the information?

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

TABLE 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 Table 2-5, if 100 calls were randomly sampled, how many calls lasted 15 minutes or longer?

TABLE 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 Table 2-5, if 100 calls were sampled, ________ of them would have lasted less than 15 minutes.

TABLE 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 Table 2-5, if 1,000 calls were randomly sampled, how many calls lasted under 10 minutes?

TABLE 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 Table 2-5, what is the width of each class?