Inferential statistics Flashcards
When is inferential statistics used?
When taking a random sample form a population and making an inference
What is the difference between statistics and parameters?
Statistics for samples, parameters for populations
What is N-1?
Degrees of freedom
What does standard deviation show?
The spread of the data
What is a statistic mean?
Mean of a sample (dash x)
What is a parameter mean?
Mean of a population (u)
What is the statistic s.d.?
s.d. of a sample (s)
What is the parameter s.d.?
s.d. of a population (o)
What is another name for mean of a sample, dash x?
Point estimate of mean
Variation of a random sample will reflect…
…variation within the population
The larger our sample size N, the more likely…
…the sample mean will reflect the population mean
What is big N?
Sample size
What is the Central Limit Theorem?
If you repeat your sampling, your sample
means will have their own distribution
