Chapter 8

Page 1

Two uses Inferential Statistics-

Hypothesis Testing- collect data in order to examine

Parameter Estimation- using sample mean to estimate population mean

Inferential Statistics depends on:

I. Probability

II. Random Sampling

Data types that can be analysed with

z-tests

data points should be independent from each

other

z-test is preferable when n is greater than

30.

the distributions should be normal if n is

low, if however n>30 the distribution of the data does not have to be

normal

the variances of the samples should be the same (F-test)

all individuals must be selected at random from the

population

all individuals must have equal chance of being

selected

sample sizes should be as equal as possible but

some differences are allowed

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