Exam 2: Organising and Visualising Data

Instruction 2.10 The table below contains the opinions of a sample of 200 people broken down by gender about the latest government plan to eliminate restraint of trade exemptions for professional sporting leagues. For Netural Ageinst Totals Female 38 54 12 104 Male 12 39 48 96 Totals 50 60 200 -Referring to Instruction 2.10,if the sample is a good representation of the population,we can expect _________ % of the males in the population will be against the plan.

Instruction 2.11 The table below contains the number of people who own a portable DVD player in a sample of 600 broken down by gender. Own a Portable DVD Player Male Fermale Yes 96 40 No 224 240 -Referring to Instruction 2.11,if the sample is a good representation of the population,we can expect _________% of those who own a portable DVD in the population will be males.

When constructing charts,the following is plotted at the class mid-points.

Instruction 2.6 The frequency distribution below represents the rents of 250 randomly selected federally subsidised apartments in Sydney. Rent in \ Frequency 300 but less than 400 113 400 but less than 500 85 500 but less than 600 32 600 but less than 700 16 700 but less than 800 4 -Referring to Instruction 2.6,_________ apartments rented for at least $400 but less than $600.

The sum of cumulative frequencies in a distribution always equals 1.

Instruction 2.5 The Stem-and-Leaf display below contains data on the number of months between the date a civil suit is filed and when the case is actually adjudicated for 50 cases heard in the Supreme Court of Victoria. Stem Leaves 1 23444 1 7899 2 2222345 5 2 678889 3 001113 3 5778 4 0234 4 5579 5 1124 5 66 6 15 6 8 Note: 1L means the 'low teens' - 10, 11, 12, 13, or 14; 1H means the 'high teens' - 15, 16, 17, 18, or 19; 2L means the 'low twenties' - 20, 21, 22, 23, or 24, etc. -Referring to Instruction 2.5,if a frequency distribution with equal-sized classes was made from this data,and the first class was '0 but less than 10',the cumulative percentage of the next-to-last class would be _________.

The original data values cannot be assessed once they are grouped into a frequency distribution table.

Instruction 2.10 The table below contains the opinions of a sample of 200 people broken down by gender about the latest government plan to eliminate restraint of trade exemptions for professional sporting leagues. For Netural Ageinst Totals Female 38 54 12 104 Male 12 39 48 96 Totals 50 60 200 -Referring to Instruction 2.10,if the sample is a good representation of the population,we can expect _________ % of the females in the population will not be against the plan.

Instruction 2.5 The Stem-and-Leaf display below contains data on the number of months between the date a civil suit is filed and when the case is actually adjudicated for 50 cases heard in the Supreme Court of Victoria. Stem Leaves 1 23444 1 7899 2 2222345 5 2 678889 3 001113 3 5778 4 0234 4 5579 5 1124 5 66 6 15 6 8 Note: 1L means the 'low teens' - 10, 11, 12, 13, or 14; 1H means the 'high teens' - 15, 16, 17, 18, or 19; 2L means the 'low twenties' - 20, 21, 22, 23, or 24, etc. -Referring to Instruction 2.5,_________of the 100 members visited the health club at least 52 times in a year.

Instruction 2.8 Given below is the stem-and-leaf display representing the amount of detergent used in litres (with leaves in 10ths of litres) in a month by 25 drive-through car wash operations in Auckland. Stem Leaves 9 147 10 02238 11 135566777 12 223489 13 02 -Referring to Instruction 2.8,if a relative frequency or percentage distribution for the detergent data is constructed,using '9.0 but less than 9.9 litres' as the first class,_________ % of drive-through car wash operations use at least 10 litres of detergent in a month.

Instruction 2.8 Given below is the stem-and-leaf display representing the amount of detergent used in litres (with leaves in 10ths of litres) in a month by 25 drive-through car wash operations in Auckland. Stem Leaves 9 147 10 02238 11 135566777 12 223489 13 02 -Referring to Instruction 2.8,if a frequency distribution for the amount of detergent used is constructed,using '9.0 but less than 9.9 litres' as the first class,the frequency of the '11.0 but less than 11.9 litres' class would be _________.

Instruction 2.4 The following are the durations in minutes of a sample of long-distance phone calls made within Australia reported by one long-distance carrier. Time (in Minutes) Relative Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 -Referring to Instruction 2.4,what is the cumulative relative frequency for the percentage of calls that lasted 10 minutes or more?

The percentage distribution cannot be constructed from the frequency distribution directly.

A graphical representation of the value of a numerical variable over time is known as a(n)_________.

Instruction 2.8 Given below is the stem-and-leaf display representing the amount of detergent used in litres (with leaves in 10ths of litres) in a month by 25 drive-through car wash operations in Auckland. Stem Leaves 9 147 10 02238 11 135566777 12 223489 13 02 -Referring to Instruction 2.12,construct a histogram for the detergent data,using '9.0 but less than 9.9' as the first class.

The larger the number of observations in a numerical data set,the larger the number of class intervals needed for a grouped frequency distribution.

In graphing bivariate categorical data,the side-by-side bar chart is best suited when primary interest is in demonstrating differences in magnitude rather than differences in percentages.

Facebook collected information on the age of their users.The youngest user was 13 and the oldest was 96.To study the distribution of the age among its users,it is best to use a pie chart.

Instruction 2.4 The following are the durations in minutes of a sample of long-distance phone calls made within Australia reported by one long-distance carrier. Time (in Minutes) Relative Frequency 0 but less than 5 0.37 5 but less than 10 0.22 10 but less than 15 0.15 15 but less than 20 0.10 20 but less than 25 0.07 25 but less than 30 0.07 30 or more 0.02 -Referring to Instruction 2.4,if 1,000 calls were randomly sampled,how many calls lasted under 10 minutes?

Figure 2.2 The histogram below represents scores achieved by 200 job applicants on a personality profile. -Referring to the histogram from Figure 2.2,_________% of the job applicants scored between 10 and 20.