Is difference due to sample variation or manipulation
For each sample there is a mean (circle in the middle) and an upper and lower interval (adjoining lines) which show how scores difference from population mean
Samples whose upper interval and lower interval do not at all fall on population mean don't contain 'true value'
Middle bar always population mean
SE = Does samples vary from population mean
2 samples from population may have differing SE
Is difference due to sample variation or manipulation
For each sample there is a mean (circle in the middle) and an upper and lower interval (adjoining lines) which show how scores difference from population mean
Samples whose upper interval and lower interval do not at all fall on population mean don't contain 'true value'
SE is the standard deviation of a sampling distribution