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Statistics & Parameters: Week 8 by
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# Statistics & Parameters: Week 8

## Parameter

### Population Parameter

Parameter associated with population/Not sample

## Statistic

### Sample Estimate

Used to estimate unknown value of population parameter

## Statistical Inference

### Preocedures for making conclusions about population parameters

Confidence Intervals, Interval of values that should cover true, unknown value

Hypothesis tests, Uses sample data to attempt to reject a hypothesis about a population., Null Value, Value indicating nothing of interest is happening., Statistical Significance, Rejecting the idea that observed results are plausible if null value is correct

## Useful terms

### mew

Used for poupulation means

### x-bar/d-bar

Notation for sample means

### p

Used for population proportions

### p-hat

Used for sample proportions

## Big 5 Parameters

### One population proportion (or probability)

What proportion or percentage....?

### Difference in two population proportions

Compare some feature of two populations

### One population mean

Average of variable for everyone in population

### Population mean for paired differences

Differences for entire population of possible pairs.

### Difference in two population means

Estimate value of difference of mean/test hypothesis that difference is 0

## Sampling Distribution

### Probability distribution of possible values of the statistic for repeated samples of the same size taken from the same population.

Standard deviation of x-bar, Standard deviation of sampling distribution of sample mean

Standard deviation of p-hat, Standard deviation of sampling distribution of a sample proportion

Standard Error, Describes estimated value of standard deviation of a statistic