The likelihood of the occurrence of an event or outcome.

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What is a Z-Score?

It is how many standard deviations the data point is from the mean. Allows us to compare scores from different distributions.

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What is Standard Error?

It is a method used to estimate the standard deviation pf the sampling distribution.

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What do small standard errors mean?

They suggest that you have a good estimate of the population mean.

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What do large standard errors mean?

indicate a great degree pf uncertainty about good the sample mean is at estimating the population mean.

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What is the Standard Error of the Mean?

Tells us how far away the sample mean is from the population mean.

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What are confidence intervals?

A Confidence Interval is a range of values we are fairly sure our true value lies in.

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What is a degree?

How well the data fit the form being considered. Co-efficient will vary from -1 to +1 (Perfect Correlation).

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What is Null Hypothesis Significance Testing?

An inferential statistics technique that produces accurate probabilities about samples when the null hypothesis is true.

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What Statistically Significant mean?

Sample data with a probability less the .05 (5%).

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What is the Level of Significance? (Alpha)

α < alpha. It is the probability value that is criterion for rejecting the null hypothesis usually .05.

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What is the Rejection Region?

The portion of a sampling distribution which includes samples with probabilities less than alpha.

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What is Hypothesis Testing?

You cannot test alternative hypothesis so use stats to test null hypothesis. Gives something precise to test. If Null is false, alternative is true.

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What is probability?

low probability - stat is unlikely to occur if null hypothesis were true. High probability - stat is likely to occur if null hypotheses were true.

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What is significance?

Effect due to systematic influence, not due to chance. .05 high probability (no effect)

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What is Type I and Type II error?

I - rejecting the null hypothesis when it is true, the probability = alpha. II - T=Retaining the null hypothesis when it is false, the probability = beta.

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What is Pearson.s Correlation?

Represented by r & measures the degree and direction of a relationship between true variables.

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What are the assumption for this correlation?

- Interval/ratio data. - normally distributed. - Linear relationship.

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What is effect size?

A measure of the size of treatment effect or strength of association, unaffected by sample size. r squared can be used a measure of the strength of the relationship.

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What is Spearman's Correlation? (rs or p)

Ordinal data, not normal distributed, relationship should be monotonic.

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Other cards in this set

Card 2

Front

What is a Z-Score?

Back

It is how many standard deviations the data point is from the mean. Allows us to compare scores from different distributions.

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