Class2 Flashcards
Statistics used to try and generalize a finding from a sample to the population of interest
Parametric
A statistic that does not rely on assumptions about the shape or underlying population distribution
Non-parametric
Scores in a normal distribution occur more the closer they are to the mean and occur less the further they are from the mean
Frequency = probability
Knowing the area under the curve allows to calculate this, the percentage that falls below a given score
Percentile ranking
The sampling distribution of the sample means approaches a normal distribution as the sample size gets larger- no matter what the shape of the population distribution
Central limit theorem
This is used to locate a particular score in terms of where it fits into an overall group of scores, and better describes where it fits in a distribution of all scores
Z scores
A persons score - the mean/standard deviation
Z score equation
=(z x10) +50
T scores formula
A number that tells individuals how far their score is from the mean
T score
The starting assumption of all statistics that any change is due simply to chance or coincidence, not because of any meaningful influence
The null hypothesis
Your research does not disprove the null hypothesis, it….
Rejects the null hypothesis with a given degree of certainty, or fails to reject the null hypothesis
The lower the p
The happier you’ll be
To the null we cannot say goodbye
When the p is too high
Probability of effect due to chance alone is measured by this,
P value 0.0 -1.0
How much people within a group differ among themselves
Within subjects variance
