The proportion of people aged 18 – 25 who currently use illicit drugs is equal to 0.20 (or
The proportion of people aged 18
–
25 who currently use illicit drugs is equal to 0.20 (or
20%).
E
xpress the null hypothesis H0 and the alternative hypothesis H1 in symbolic form. Be
sure to use the correct symbols
—
μ, p
, and
σ
—
for the indicated parameter.
Re
fer to the following data:
o
Two

tailed test; 0.10
o
Assume that the normal distribution applies and find the critical
z
values.
Use the following information to find the P

value.
o
The
value of the
test statistic
for a
right

tailed
one mean z test is z
= 2.50
.
o
Use a 0.05 significance level and state the conclusion about the null hypothesis
—
reject the
null hypothesis or fail to reject the null hypothesis.
Test the claim:
A simple random sample of 50 adults is obtained, and each person’s red blood cell
count (in
cells per micro

liter) is measured. The sample mean is 5.23. The population standard
deviation for red blood cell counts is 0.54. Use a 0.01 significance level to test the claim that the
sample is from a population with a mean less than 5.4, which is a va
lue often used for the upper
limit of the range of normal values. What do the results suggest about the sample group?
Identify the null hypothesis, alternative hypothesis, test statistic,
P

value or critical value(s),
conclusion about the null hypothesis,
and the conclusion that addresses the original claim. Use the
P

value methodTutor Answer
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