Chapter 5-8 Flashcards
(28 cards)
Sample
A smaller portion taken from the population
Primary source data
Collected directly by researcher
Micro data
Data collected on one individual
Secondary source data
Data used by someone other than whose who actually collected them
Aggregate data
Combined data that cannot be broken down
Response bias
When participants change their answer due to personal feelings or embarrassment
Sampling bias
When sample does not represent the population on a whole
Non response bias
When opinions are only given by those who are on either side of spectrum due to personal beliefs and strong feelings
Measurement bias
When the method is such that t.he characteristics are over or under represented
Mean
Sum of data divided by number of entries (sample mean is xbar)
Median
Middle value of all data
Mode
Data that occurs most often
Percentile
Percent of data that are less than or equal to a value
Quartile
Three points that divide the data into three equal parts (25 is the smallest) (50 is the median) (75 is the largest)
Interquartile range
Difference between first and third quartile
Standard deviation
Square root of the variance
Sample z score
Xbar
Zscore
How many standard deviations away
Population
All the individuals in a study group
Normal distribution
Continuous, symmetrical, bell shape probability
Confidence interval
How confident you are the mean lies within a certain interval
Confidence Level
How confident you are a stat is within a particular range
Margin of Error
Range of values a measurement is said to be in
Cause and effect relationship
Correlation between two variables in which a change in one directly effects the other
