Question
7.2(8e) A random sample of 84 eighth grade students' scores on a national mathematics assessment test has a mean score of 294. This test result
7.2(8e)
A random sample of
84
eighth grade students' scores on a national mathematics assessment test has a mean score of
294.
This test result prompts a state school administrator to declare that the mean score for the state's eighth graders on this exam is more than
285.
Assume that the population standard deviation is
37.
At
=0.09,
is there enough evidence to support the administrator's claim? Complete parts (a) through (e).
Question content area bottom
Part 1
(a) Write the claim mathematically and identify
H0
and
Ha.
Choose the correct answer below.
A.
H0:
=285
Ha:
>285
(claim)
B.
H0:
285
Ha:
>285
(claim)
Your answer is correct.
C.
H0:
285
(claim)
Ha:
>285
D.
H0:
285
(claim)
Ha:
<285
E.
H0:
<285
Ha:
285
(claim)
F.
H0:
=285
(claim)
Ha:
>285
Part 2
(b) Find the standardized test statistic z, and its corresponding area.
z=2.232.23
(Round to two decimal places as needed.)
Part 3
(c) Find the P-value.
P-value=0.0130.013
(Round to three decimal places as needed.)
Part 4
(d) Decide whether to reject or fail to reject the null hypothesis.
Reject Upper H 0
Reject
H0
Your answer is correct.
Fail to reject Upper H 0
Failtoreject
H0
Part 5
(e) Interpret your decision in the context of the original claim.
At the
9%
significance level, there
is
is not
enough evidence to
support
reject
the administrator's claim that the mean score for the state's eighth graders on the exam is more than
285.
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