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Definition
Physical representation of the population 


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Definition
Equal chance of being chosen; chosen independently; all combos possible 


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The difference between a sample stat and a population parameter that's just due to chance. As n increases the sampling error decreases. 


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Definition


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Definition
The sampling distribution of means will have a mean equal to mu and a standard error equal to sd/sq rt of n. Normal distribution. 


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Definition
We know how much confidence we can place in our estimate and are trying to guess that the mean of the population is within our interval 


Term
level of confidence vs level of precision 

Definition
As one increases the other decreases 


Term
The relationship between a level of conﬁdence, a standard error, and the interval (centered on xbar) that probably contains μ 

Definition


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Definition
We use the ttable when the standard deviation (o) is unknown. 


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Definition


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What makes a tcurve different from a normal curve? 

Definition
It uses degrees of freedom 


Term
What is the relationship between confidence and significance? 

Definition


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Definition
Indirect statement of the width of the confidence interval. plus and minus a number. 


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Definition
The hypothesis that is tested 


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a hypothesis that stands in opposition if there is a significant difference among three or more groups of samples. 


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Definition
Probability of making a type I error 


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Definition
A score that has a low probability of occurrence. 


Term
region of rejection/critical region 

Definition
The test stat (Z) is equal to or falls below the critical value, which in turn allows us to reject the null hypothesis. 


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Definition
Number of standard errors away from the mean in the sample. Beginning of the rejection region 


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Definition
compare the critical value to the null hypothesis to determine is something is statistically significant 


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Definition
The rejection of the null when it is true. Alpha marks the probabilitity of making a type I error 


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Sample that involves cases or subjects that share certain characteristics in common. 


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Definition
The difference between two population means (mu). 


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Definition
the mean of the differences between two population means 


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mean of the null distribution in a relatedsample design 

Definition


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Definition
The selection of cases/subjects included in one sample has no connection to or influence on the selection of cases/subjects in the other sample 


Term
Statistic for analysis in n=1 design 

Definition


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Statistic for analysis with mu known and a single x bar 

Definition


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Statistic for analysis in a relatedsamples design 

Definition


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Statistic for analysis in an independentsamples design 

Definition


Term
what is the mu of the null distribution of an independent samples design 

Definition


Term
Standard error of the sampling distribution in an independent samples design 

Definition
that big formula on the formula sheet 


Term
mean difference vs difference of means 

Definition

