SOLUTION: It has been found that the average time
Internet users spend online per week is 18.3 hours. A
random sample of 48 teenagers indicated that their
mean amount of Internet time per
Algebra.Com
Question 1161943: It has been found that the average time
Internet users spend online per week is 18.3 hours. A
random sample of 48 teenagers indicated that their
mean amount of Internet time per week was 20.9 hours
with a population variance of 32.49. At the 0.02 level of
significance, can it be concluded that the mean time
differs from 18.3 hours per week?
a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Compute the test value.
d. Make the decision.
e. Summarize the results.
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Ho: the mean time=18.3 hours/week
Ha: the mean time is not equal to 18.3 hours/wee
alpha=0.02 P{reject Ho|Ho true}
test statistic is a z
critical value: reject Ho if |z|>2.303
calculation z=(x bar-mean)/sigma/sqrt(48); sigma=sqrt (V)=5.7
z=2.6*sqrt(48)/.5.7
=3.16
reject Ho and conclude that the mean time spent on the Internet is differs from 18.3 hours per week.
p=0.0016
RELATED QUESTIONS
U.S. internet users spend an average of
18.3 hours a week online. If 95% of users spend... (answered by MathLover1)
Suppose that the amount of time teenagers spend on the internet per week is normally... (answered by ewatrrr)
The average teenager spends 7.5 hours per week playing computer and video games. In a... (answered by stanbon)
It was found out that average intake of medicine in a group of patients is 110mg with... (answered by stanbon)
What kinds of Web sites do males aged 18 to 34 visit most ofen? Was found about 50% of... (answered by ewatrrr)
A recent article in a leading magazine claimed that the homemakers spend an
average... (answered by Theo)
A recent article in a leading magazine claimed that the homemakers spend an... (answered by CPhill)
A management consultant found thathe amount of
time per day spent by executives... (answered by Boreal)
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by... (answered by ikleyn)