Flashcards
STATS 6-9
Cards in this deck (21)
- 1Point estimatea number that estimates a population parameter, a statistic
- 2What is a confidence intervalwhen we express the confidence we have that it contains the parameter. Expressed as a %.
- 395% confidencewe have 95% confidence that the mean(µ) lies in the interval m±za/2(σm), because 95% of all possible intervals computed this way will capture µ
- 4what is za/2a z score for which (a)1--% of the standard normal distribution lies outside the interval +/-za/2
- 5what does it mean to say we have (1-a)100% confidence in an intervalIts an interval around a statistic. We know that (1-a)100% of all such intervals will capture the parameters estimated by the statistic
- 6what are the 4 quantities needed to calculate a confidence intervalm, σ, n, a
- 7what quantities affect interval widthm: does not effect it
σ: as it increases width increases
N:width decreases as n increases
A:interval width decreases as a increases - 8What assumptions must be made when computing confidence interval when σ is knownWe must assume the distribution of means is normal
- 9Test statisticcomputed from a sample statistic
- 10zobs(m−μ)/σm
- 11P-VALUESthe probability of a statistic or one more extreme, occurring by chance when the null hypothesis is true
- 12Null hypothesisis a hypothesis about the distribution of scores from which the sample mean was drawn
- 13p<.05statistically significant
- 14p>.05not statistically significant
- 15determinants of powersample size, effect size, a
- 16powerthe probability of correctly rejecting the null when it is false. probability of correcting rejecting the null
- 17type 1 errorrejecting the null when it is true
- 18type 2 errorwhen we retain the null hypothesis when it is false
- 19aprobability of a type 1 error
- 20Bprobability of a
type 2 error - 21mcriticalµ0+ z critical (σm): the value that sample mean must exceed in order for us to reject the null
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- Psychology Flashcards on STATS 6-9, created by Tamra Lewallen on 12/03/2019.
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- Tamra Lewallen
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