SOLUTION: In order to estimate the mean amount of time computer users spend on the internet each​ month, how many computer users must be surveyed in order to be 90​%
confident
Algebra.Com
Question 1065438: In order to estimate the mean amount of time computer users spend on the internet each month, how many computer users must be surveyed in order to be 90%
confident that your sample mean is within 15 minutes of the population mean? Assume that the standard deviation of the population of monthly time spent on the internet is 195 min. What is a major obstacle to getting a good estimate of the population mean? Use technology to find the estimated minimum required sample size.
The minimum sample size required is computer users.(Round up to the nearest whole number.)
What is a major obstacle to getting a good estimate of the population mean?
A.It is difficult to precisely measure the amount of time spent on the internet, invalidating some data values.
B.The data does not provide information on what the computer users did while on the internet.
C.There may not be 458 computer users to survey.
D.There are no obstacles to getting a good esitmate of the population mean.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
we use the following formula for margin of error(ME)
:
ME = z * s / square root(n) where z is the z-score we use to calculate the confidence interval, s is the standard deviation, n is sample size and ME is the desired margin of error
:
we want a 90% confidence interval(CI)
:
alpha(a) = 1 - (90/100) = 0.10
:
critical probability(p*) = 1 - (a/2) = 0.95
:
z-score associated with p* is 1.644853
:
15 = (1.644853) * 195) / square root(n)
:
square root(n) = 320.746335 / 15
:
*******************************
n = 457.2365 approximately 457
:
answer is C
******************************
:
RELATED QUESTIONS
n order to estimate the mean amount of time computer users spend on the internet... (answered by Theo)
PLEASE HELP!!
In order to estimate the mean amount of time computer users spend on the... (answered by ewatrrr)
A city is interested in estimating the amount of time children spend on the internet... (answered by ewatrrr)
The amount of time that office workers at Company XYZ spend on the computer each workday... (answered by ewatrrr)
The table below illustrates the world growth in Internet use.
Year 2001 had 494.1... (answered by Theo)
A recent study of 750 Internet users in Europe found that 35% of Internet users were... (answered by stanbon)
Nice App Inc. wants to provide a special digital reward for users that spend more than... (answered by CPhill)
The formula b(t) = 1.353(1.9025)^t represents the number of broadband internet users (in... (answered by bucky)
The formula b(t) = 1.353(1.9025)^t represents the number of broadband internet users (in... (answered by checkley77)