for an alternative hypothesis of Ha: u > uo, we might possibly
reject the null hypothesis if
the sample mean is greater than uo
suppose you are performing a hypothesis test on u and the
value of ó is known. At the 5% significance level, the critical
value(s) for a two tailed test is (are)
-z0.025 and z 0.025
the two equivalent methods to solve a hypothesis test are the
critical value approach
p-value approach
in inferential stats, we use ____ information to make
inferences about an unknown ____ parameter
sample, population
when testing u, the p-value is the probability of obtaining a
sample mean at least as large or at least as small as the one
derived from a given sample, assuming the ___ hypothesis is
true
Null
we do not reject the null hypothesis when the p-value is
>= a
for a hypothesis test of u when ó is known, the value of the
test statistic is calculated as
z = (x- - uo)/ (ó/sqrt n )
put the following steps in the p-value approach to hypothesis
testing in the correct order.
specify the null and alternative
hypothesis
specify the significance level
calculate the value of the test statistic
and its p-value
state the conclusion and interpret
results
a quality control officer believes that the average time of use
for AAA batteries differs from the claimed 8.5 hours. The QC
take a random sample of 30 AAA batteries and finds that the
sample mean is 8.7 hours. State the null and alt hypothesis for
testing the claim
Ho: u = 8.5
Ha: u not equal 8.5
a type 1 error is commonly denoted as
a (alpha)
we choose a value for a before conducting a hypothesis test
True
an important final conclusion to a statistical test is to
clearly interpret the results in terms of
the initial claim
The basic principle of hypothesis testing is to first assume that
the ____ hypothesis is true and then determine if the sample
data ___ this assumption
Null,
contradicts
if the population standard deviation is unknown, it can be
estimated by using
S
in hypothesis testing, two
incorrect
decisions are possible
Not rejecting the null hypothesis when
it is false
Rejecting the null hypothesis when it is
true
a 95% confidence interval for the mean value of a store's
customer accounts is computer as $850 +- 70, then the null
780, 920
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4:15 PM
STATS Page 1

customer accounts is computer as $850 +- 70, then the null
hypothesis of a two tailed hypothesis test would be rejected if
the value of uo is less than $____ or greater than $____
the critical value approach specifies a region of values, called
the ___. If a test statistic falls into this region, we reject the
___
rejection region, null hypothesis
the alternative hypothesis for a two sided test for a
population mean would be denoted as
Ha: u =/ (not equal) uo
the alternative hypothesis
contests the status quo for which a
corrective action may be required
in hypothesis testing, two
correct
decisions are possible
rejecting the null hypothesis when it is
false
not rejecting the null when it is true
we can reject the null when the
p-value < a
when testing u and ó is known, Ho can never be rejected if z
<= 0 for a
right tailed test

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