Statistical Methods in Practice
Different types of grapes used to make wine.
qualitative
Variables that classify individuals into categories are called
qualitative
The horsepower of motorcycles in a dealership.
quantitative
variables are always numerical.
quantitative
Which of the columns represent nominal or ordinal variables? The variable Movie Title is ▼neither nominal or ordinal. The variable Release Year is ▼nominal. The variable Studio is ▼nominal. The variable Ticket Sales (millions of $) is ▼nominal. The variable Running Time (minutes) is ▼nominal.
The variable Movie Title is ▼ordinal. The variable Release Year is ▼neither nominal or ordinal. The variable Studio is ▼nominal. The variable Ticket Sales (millions of $ ) is ▼neither nominal or ordinal. The variable Running Time (minutes) is ▼neither nominal or ordinal.
Which island is the smallest from those in the graph?
Great Britain
In a ▼double-blind experiment, neither the investigators nor the subjects know who is getting which treatment.
In a ▼double-blind experiment, neither the investigators nor the subjects know who is getting which treatment.
The average ACT score of all testers from a local high school is 23.
Parameter
The entire collection of individuals about which information is sought is called a
Population
Which of the columns represent qualitative or quantitative variables? The column Channel represents ▼(Choose one) variables. The column Subscribers (millions) represents ▼(Choose one) variables. The column Language represents ▼(Choose one) variables. The column Category represents ▼(Choose one) variables.
Qual; quan; qual; qual
In a large retail company, a simple random sample of 10 employees at each store were asked for their opinion about new employee benefits.
The sample is a Stratified sample.
A pollster obtains a list of all the residential addresses in a certain town, and uses a random number generator to choose 150 of them. The pollster visits each of the 150 households and interviews all the adults in each household about their television viewing habits.
The sample is a cluster sample.
A sports columnist asks people in a bar about the potential basketball lockout.
The sample is a convenience sample.
A caterer is competing for a company's business. The caterer selects every 3rd item off the menu for a tasting.
The sample is a systematic sample.
The variable Game Title is ▼ordinal. The variable Publisher is ▼nominal. The variable Percentage of Gaming Audience is ▼neither nominal or ordinal. The variable Average Minutes Played per Week is ▼neither nominal or ordinal.
The variable Game Title is ▼ordinal. The variable Publisher is ▼nominal. The variable Percentage of Gaming Audience is ▼neither nominal or ordinal. The variable Average Minutes Played per Week is ▼neither nominal or ordinal.
A doctor's office contacts all patients who visited the office in the month of July to ask their opinion on new billing procedures.
This is not a simple random sample.
A sports columnist posts an online survey asking viewers to rate their favorite sports players.
Voluntary
__________ samples are often used by the media to try to engage the audience.
Voluntary Response
Which of the columns represent nominal or ordinal variables? The variable Game Title is ▼ordinal. The variable Initial Release Year is ▼neither nominal or ordinal. The variable Developer is ▼nominal. The variable Copies Sold (millions) is ▼neither nominal or ordinal.
Which of the columns represent nominal or ordinal variables? The variable Game Title is ▼ordinal. The variable Initial Release Year is ▼neither nominal or ordinal. The variable Developer is ▼nominal. The variable Copies Sold (millions) is ▼neither nominal or ordinal.
The volume of gas to fill up your tank.
continuous
A (An) ▼(Choose one) variable is a quantitative variable whose possible values can be listed.
discrete
The number of keys on your key ring.
discrete
In an experiment, half of the participants are randomly assigned to take a daily vitamin C tablet, while the other half of the participants take the placebo. At the end of the winter season, more participants in the placebo group developed colds than did the participants in the vitamin C group.
not likely
Randomized experiment or observational study? Do you think it is possible to design a randomized experiment to study this question, or will an observational study be necessary? A scientist wants to determine whether people who live in places with high levels of air pollution get more colds than people in areas with little air pollution.
observational
A local science fair awards gold, silver, and bronze ribbons.
ordinal
I finished first in the high jump and third in the pole vault.
ordinal
Which of the columns represent qualitative or quantitative variables? The column Movie Title represents ▼(Choose one) variables. The column Release Year represents ▼(Choose one) variables. The column Studio represents ▼(Choose one) variables. The column Ticket Sales (millions of $) represents ▼(Choose one) variables. The column Running Time (minutes) represents ▼(Choose one) variables.
qual; quan; qual; quan; quan
A math department chair wants to determine the effectiveness of online homework systems. She chooses four college algebra classes and assigns a different online homework system to three of the classes. One class does not use any online homework system. She administers a common pretest and final exam to measure the effectiveness.
randomized
True or false: On the average, families spent less on dairy products than on fruits and vegetables.
true
are highly unreliable in part because people who have strong opinions are more likely to participate.
voluntary
A ▼Pareto chart is a bar graph in which the bars are ordered by size.
-
Approximately how large is Sumatra? Sumatra is approximately ▼450,000 km2.
-
Approximately how much larger is New Guinea than Madagascar? New Guinea is approximately ▼200,000 km2 larger than Madagascar.
-
In a data set, the proportion of items that are in a particular category is called the ▼relative frequency.
-
In a data set, the proportion of items that are in a particular category is called the ▼relative frequency. A ▼pie chart is represented by a circle in which the sizes of the sectors match the relative frequencies of the categories.
-
True or False: Honshu and Great Britain together are larger than New Guinea. It is ▼false that Honshu and Great Britain together are larger than New Guinea.
-
True or false: Fewer than one in five games sold is an E10-rated game. It is ▼false that fewer than one in five games sold is an E10-rated game.
-
True or false: More than half of the people surveyed said that things would be the same or better in five years. It is ▼false that more than half of the people surveyed said that things would be the same or better in five years.
-
True or false: More than twice as many E-rated games are sold as M-rated games. It is ▼true that more than twice as many E-rated games are sold as M-rated games.
-
What percentage of people said that things would be worse or same in five years? The percentage of people said that things would be worse or same in five years is 62%.
-
Which was the most common response? The most common response was ▼worse.
-
A ▼(Choose one) sample is one in which the population is divided into groups and a random sample of groups is drawn.
Cluster
A sample that is not drawn by a well-defined random method is called a _________ sample.
Convenience
Determine whether the data described are at the interval level or the ratio level. Your age in years. The data represent the ▼(Choose one) level of measurement.
Ratio
A __________ is a subset of a ___________ containing the individuals that are actually observed.
Sample; Population
A ____________ sample is a type of sample that is analogous to a lottery.
Simple Random
Five hundred people attend a charity event, and each buys a raffle ticket. The 500 ticket stubs are put in a drum and thoroughly mixed, and 10 of them are drawn. The 10 people whose tickets are drawn win a prize.
Simple random
A __________ is a number that describes a sample.
Statistic
According to a survey of mothers of football players, 62% feel that their kids are safe playing the sport.
Statistic
A _________ sample is one in which the population is divided into groups and a random sample is drawn from each group.
Stratified
In a data set, the number of items that are in a particular category is called the
frequency
The outdoor temperature in Celsius.
interval
On which food category was the most money spent?
meat poultry eggs
Qualitative variables can be divided into two types:
nominal and ordinal
