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

timer Asked: Jun 14th, 2015

Question description

The proportion of people aged 18

25 who currently use illicit drugs is equal to 0.20 (or



xpress the null hypothesis H0 and the alternative hypothesis H1 in symbolic form. Be

sure to use the correct symbols

μ, p

, and


for the indicated parameter.


fer to the following data:




tailed test; 0.10


Assume that the normal distribution applies and find the critical



Use the following information to find the P





value of the

test statistic

for a




one mean z test is z

= 2.50



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,



value or critical value(s),

conclusion about the null hypothesis,

and the conclusion that addresses the original claim. Use the



value method

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