Insufficient evidence to conclude that herbal supplements
reduce blood pressure.
(b)
(DESIGN)
State Significance Level
of the
test and explain what it means,
α
=.10, the maximum probability of
making Type I error, which would
be incorrectly claiming blood
pressure was lowered.
(c)
(DESIGN)
Determine the statistical model
(test statistic)
Matched pair t-test – dependent
sampling.
(d)
DESIGN)
Determine decision rule
(pvalue
method)
Reject Ho if pvalue <
α

12.
A random sample of 25 waiting times (in minutes) before patients saw a medical professional in a hospital's
minor emergency department had a standard deviation of 0.7 minute. After a new admissions procedure was
implemented, a random sample of 21 waiting times had a standard deviation of 0.5 minute. At a = 0.10, can you
support the hospital's claim that the standard deviation of the waiting times has decreased?
(a)
(DESIGN)
State your Hypothesis
(d)
(DESIGN)
Determine decision rule
(critical value method)
σ
2

(b)
(DESIGN)
State Significance Level of the test and
explain what it means.
(c)
(DESIGN)
Determine the statistical model (test
statistic)

13.
An engineer wants to compare the tensile strengths of steel bars that are produced using a conventional