Key Terms
All subjects that are being studied
What is population
Data that use numeric values to indicate "how much" or "how many"
What is quantitative data
Room numbers in a hospital
What is nominal
A sample is biased if you only send a survey out to a certain demographic, but use the results to make a wide generalization
True
Over a 4-month period, among 30 people with bipolar disorder, patients who were given a high dose (10 g/day) of omega-3 fats from fish oil improved more than those given a placebo.
What is an experimental study
A characteristic of interest for the elements
What is a variable
Data that can be grouped by specific categories
What is qualitative data
SAT Exam Scores
What is interval
Descriptive statistics is when a researcher generalizes data from samples to populations, performs estimations, determines relationships among variables, and makes predictions
False
Among a group of disabled women aged 65 and older who were tracked for several years, those who had a vitamin B12 deficiency were twice as likely to suffer severe depression as those who did not
What is an observational study
This type of data is often called categorical data
What is qualitative data
A restaurant rating (in stars)
What is ordinal
The four levels of measurement are nominal, ordinal, inferential, and ratio
False
In a test of roughly 200 men and women, those with moderately high blood pressure (averaging 164/38 mm Hg) did worse on tests of memory and reaction time than those with normal blood pressure
What is an observational study
The art and science of collecting, analyzing, presenting, and interpreting data
What is statistics
This type of variable describes a piece of data that can be counted
What is a discrete variable
The amount of money spent on goods in a given period
What is ratio
You should always take very small samples. That way you have less data to have to enter and work with!
FALSE ....why?
In 2002 the journal Science reported that a study of women in Finland indicated that having sons shortened the lifespan of mothers by about 34 weeks per son, but that daughters helped to lengthen the mothers' lives. The data came from church records from a period of 1640 to 1870
What is an observational study.
A subset of the population
What is a sample
This type of variable is used to describe data that is obtained by measurement or measuring
What is a continuous variable
The current range of body-temperatures in this room right now (in degrees Fahrenheit)
What is interval
The difference between interval and ratio level of measurement is that a zero for one of the levels means something whereas having a zero for the other level doesn't mean anything rather important.
True!
Some people who race greyhounds give the dogs large doses of vitamin C in the belief that the dogs will run faster. Investigators at the University of Florida tried three different diets in random order on each of five racing greyhounds. They were surprised to find that when the the dogs ate high amounts of vitamin C they ran more slowly.
What is an experimental study