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Chapter 9.1-9.3 by Mind Map: Chapter 9.1-9.3
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Chapter 9.1-9.3

Mind on Statistics, 3rd edition, Utts Heckard, Thomson Brooks Cole, 2007

Section 9.1

Parameter

"A parameter is a numberical summary of a population. Its value is considered to be fixed and unchanging." (Utts, 2007)

Statistic

"A statistic, or sample statistic, is a numerical summary of a sample.  its value may be different for different samples.  The term sample estimate or estimate is synonymous and reinforces the idea that a statistic often is used to estimate the corresponding population parameter." (Utts, 2007)

Statistical Inference

Statistical inference or statistical induction comprises the use of statistics and random sampling to make inferences concerning some unknown aspect of a population. It is distinguished from...

Section 9.3

Sampling distribution

Is the probability distribution of possible values of the statistic for repeated samples of the same size taken from the same population.

Standard deviation of x

The standard deviation of the sampling distribution of a sample mean.

Standard deviation of p

The standard deviation of the sampling distribution of a sample proportion.

Standard error

describes the estimated standard deviation for a sampling distribution.

Section 9.2

Population Proportion

Which is a number between 0 and 1 representing the proportion with that trait.

Population mean

One of the simplest summaries for the population is the average of the variable for everyone in the population.

Paired Difference

Data that are formed by taking the differences in matched pairs.

Population mean for paired differences

Which is the mean that we would get if we took differences for the entire population of possible pairs.

Independent samples

The individuals in one sample are not coupled in any way with the individuals in the other sample.

Difference in two population means

The parameter of interest is the difference in two population means.