A study of the dietary habits of 20,000 men was conducted to find a link between high intakes of dairy products and prostate cancer. The population is
Determine whether the numerical value is a parameter or a statistic.
A survey of 1000 U.S. adults found that 40% think that the Internet is the best way to get news and information.
At a college, 90% of the members of the Board of Trustees approved the contract of the new president.
A survey of 733 small business owners found that 17% have a current job opening
parameter
statistic
Determine whether the data are qualitative or quantitative.
A list of debit card pin numbers
The final scores on a video game
qualitative
quantitative
Determine the level of measurement of the data set
The years of birth for the runners in the Boston marathon
The horsepowers of racing car engines
A list of badge numbers of police officers at a precinct
The top 10 grossing films released in a year
Nominal
Ordinal
Interval
Ratio
Determine whether the study is an observational study or an experiment.
Researchers conduct a study to determine whether taking a multivitamin daily decreases the risk of major cardiovascular events among men. To perform the study, researchers studied 14,671 men and had one group take a multivitamin daily and had another group take a placebo daily.
Researchers conduct a study to determine whether body mass index (BMI) influences the frequency of migraines. To conduct the study, researchers asked 162,576 people for their BMIs and the numbers of migraines they have per month.
Observational Study
Experiment
An experiment is performed to test the effects of a new drug on high blood pressure. The experimenter identifies 320 people ages 35-50 years old with high blood pressure for participation in the experiment. The subjects are divided into equal groups according to age. Within each group, subjects are then randomly selected to be in either the treatment group or the control group. What type of experimental design is being used for this experiment?
Identify the sampling technique used in each study.
A study on attitudes about smoking is conducted at a college. The students are divided by class (freshman, sophomore, junior, and senior). Then a random sample is selected from each class and interviewed.
A journalist goes to a campground to ask people how they feel about air pollution
For quality assurance, every tenth machine part is selected from an assembly line and measured for accuracy.
Convenience
Systematic
Stratified
Cluster
Which sampling technique used in Exercise 7 could lead to a biased study? Explain your reasoning.