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Chapter 26
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14
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04/11/2005

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Term
test of significance is defined as
Definition
whether an observed difference is real or just a chance variation
Term
what is a null hypothesis
Definition
a statement about the box that represents a population (example is the average of the box equals 50).
Term
what is the alternative hypothesis
Definition
a statement about the box like "the average of the box does equals 50"
Term
null says the difference is
Definition
chance
Term
the alternative says the difference is
Definition
real
Term
what does test statistic Z = (observed - expected)/SE do?
Definition
it measures the difference between the data and what is expected in the box with null hypothesis being true. If given the SD, use the information to compute SE in the denominator. If not given the SD, estimate it from the data.
Term
P-value of the statistic means
Definition
on the basis of the null hypothesis is being right, the chance of getting a test statistic as extreme or more extreme than the observed statistic is computed.
Term
a small P-value is a sign of what
Definition
that besides chance, certain other thing is acting on to make the difference
Term
a low P-value for the statistical test points to what
Definition
to rejection of the null hypothesis because it indicates how unlikely it is for a test statistic as extreme as or more extreme than the one given by this data to be observed from this population if theull hyposthesis is true.
Term
when the sample is below 25 we don't use the Z test. what test do we use?
Definition
the T test
Term
Null says the hypothesis is real or chance
Definition
chance
Term
the equals sign will only appear in the null statement true or false
Definition
true
Term
when the sample is below 25 we use what formula
Definition
the t-test
Term
if the sample is larger than 25 we use what formula
Definition
the Z-test
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