Chapter 1 Quiz
A reporter of Newsweek stands on a street corner and asks 10 adults if they feel that the current president is doing a good job.
10 adults = sample and it is not likely to be representative of the population because it is not random
In a Gallup pool of 1059 randomly selected adults, 39% answered yes when asked Do you have a gun in your home?
1059 = sample 39% = statistic
A researcher surveys 5000 randomly selected households and finds that among the TV sets in use, 19% are tuned to 60Minutes
5000 = sample 19% = statistic
A marketing executive for General Motors find that its public relations department has just printed envelopes with the names and addresses of all Corvette owners. She wants to do a pilot test of a new marketing strategy. She obtains a sample group by pulling 50 of those envelope.
convenience
A statistic student obtains height/weight data by interviewing family members.
convenience
An NBC television news reporter gets a reaction to a breaking story by polling people as they pass the front of his studio.
convenience
An economist collects data by interviewing people who won the lottery between the year 1995 and 2014.
cross sectional
The US. Labor Department obtains current unemployment data by polling 50,000 people this month.
cross sectional
Much controversy arose over a study of patients with syphilis who were not given a treatment that could have cured them. Their health was followed for years after they found to have syphilis.
observational
The Bureau of Weights and Measures randomly selects gas station and obtains 1 gallon of gas from each pump. The amount pumped is measure
observational ( measure)
Consumer Reports magazine rating of best buy, recommended, not recommended
ordinal
Rating of fantastic, good, average, poor, unacceptable for blind dates.
ordinal & qualitative
The current Senate of the US consists of 87 men and 13 women.
parameter (b/c describes the population)
In a study of all 2223 passengers aboard the Titanic, it was found that 706 survived when it sank.
parameter (the study is on all 2223 passenger)
A researcher from NYU school of Medicine plans to obtain data by following ( to year 2016) siblings of victims who perished in the World Trade Center attack of 9/11, 2001
prospective
How often do you buy books on the internet?, satisfaction at work place
qualitative (never, rarely, often) & ordinal
How do you rate the internet provider?
qualitative (rating the service), ordinal (excellent is better than poor)
Do you buy books on the internet? / gender, department name, marital status
qualitative (yes or no question) & nominal
Color of your car
qualitative, nominal
Numbers on the jersey of basketball players in the NBA
qualitative, nominal
Social security numbers, ID numbers, cell phone number, zip codes
qualitative, nominal
How much do you spend on books during one year?
quantitative, continuous (asking money), ratio (can have zero)
What year do you start buying books on the internet, employee since enter year
quantitative, discrete (countable/ no decimal), interval (cannot have zero
How many books do you buy during one year?, salary
quantitative, discrete, ratio
number of vacation days in the last year/ number of sick days in the last year
quantitative, discrete, ratio
In a Gallup pool of 1059 adults, the interview subjects were selected by using a computer to randomly generate telephone numbers that were called.
random
Heights of women basketball players in the WMBA.
ratio
A researcher from NYU school of Medicine obtains data about head injuries by examining the hospital records from the past five years
retrospective
A sample of student is selected and the average amount of time waiting in line to buy textbooks this semester is 0.65 hour.
statistic
A sample of student is selected and the average number of textbook purchased this semester is 4.2.
statistic (b/c it describes the sample of student)
A General Motor researcher has partitioned all registered a cars into categories of subcompact, compact, mid-size, intermediate, and full size. She is surveying 200 car owners from each category
stratified
An economist is studying the effect of education on salary and conducts a survey of 150 randomly selected workers from each of these categories: less than a high school degree; high school degree; more than a high school degree.
stratified
A police sobriety checkpoint stopped every 5th driver.
systematic
The Dutchess County Commissioner of Jurors obtains a list of 42,763 car owners and constructs a pool of jurors by selecting ever 100th name on that list.
systematic (every 100th )
A college conducts a study of student drinking by randomly selecting 10 different classes and interviewing all of the students in each of those classes.
cluster
CNN is planning an exit poll in which 100 polling station will be randomly selected and all voters will interviewed as they leave the premises.
cluster
A graduate student conducts a research project about how Americans communicate. She begins with a survey mailed to 15000 adults that she knows. She asks them to mail back a response to this question: Do you prefer to use e-mail or snail mail? She gets back 200 responses, with 110 of them indicating a preference for snail mail.
1500 = population 200 responses = sample 110 = statistic not a representative of the population because it is a voluntary.
Patient are given Lipitor to determine whether this drug has the effect of lowering high levels of cholesterol.
experiment
Cruise ship passengers are given magnetic bracelets, which they agree to wear in an attempt to eliminate or dimmish the effects of motion sickness.
experimental
The number of yes responses received when 1250 drivers are asked if they have ever used a cell phone while driving
interval
Year you will graduate from college, IQ score
interval
Current temperature of the classrooms at your college
interval, continuous
