# The proportion of people aged 18 – 25 who currently use illicit drugs is equal to 0.20 (or

Sigchi4life
Category:
Statistics
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Question description

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),

and the conclusion that addresses the original claim. Use the

P

-

value method

(Top Tutor) Daniel C.
(997)
School: Duke University
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