![natetheman7740](/avatars/39942.jpg)
natetheman7740
10.09.2019 •
Mathematics
Eric wants to estimate the percentage of elementary school children who have a social media account. he surveys 450 elementary school children and finds that 280 have a social media account. identify the values needed to calculate a confidence interval at the 99% confidence level. then find the confidence interval.
Solved
Show answers
More tips
- H Health and Medicine What to Eat to Lose Weight?...
- S Society and Politics Will Japan become Russia s Military Enemy?...
- P Philosophy Is Everything We Strive for Eventually Achieved and Destroyed?...
- S Society and Politics Understanding Politics and Its Role in the Development of Civilization...
- P Philosophy Why Did God Create Man and Place Him in Obscurity?...
- S Society and Politics Skoptsy: Who They Are and How They Perform Castration?...
- O Other Childhood Fears: What Many of Us Experienced...
- P Philosophy What is Something for you?...
- H Health and Medicine Why Do Humans Have One Heart?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
Answers on questions: Mathematics
- M Mathematics In the lotka-volterra predator-prey model dx/dt=-ax+bxy,dy/dt=ey-cxy, where x(t) is the predator population and y(t) is the prey population, the coefficient c represents which...
- M Mathematics Adrian made six free-throws out of eight he attempted how many would you expect to make if you made 20 attempts...
- M Mathematics Larry has 9 yards of fabric. he will use 2 yards to make each vest. how many vests can larry make?...
- M Mathematics 1. stefan has 24 photos to display on some posters. select a way that he could display all of the photos in equal groups on the posters. mark all that apply....
- M Mathematics What is the answer to this question...
- M Mathematics which of the following shows a translation of f(x) two units to the left? a) f(x) – 2 b) f(x + 2) d) f(x) + 2 c) f(x – 2)...
- M Mathematics Find thier domain, range, and function f(x) = 3x - 5 f(x) = 4x + 7...
- M Mathematics If Keegan has 15 nickels and quarters in his pocket, and they have a combined value of 195 cents, how many of each coin does he have? __quarters __nickels...
- M Mathematics Hi, can anybody help with this math question?...
- M Mathematics Tanya must add 8% sales tax to the initial cost of a job. She then adds 15% to the cost, including sales tax, to find the amount to charge a client. Tanya charges one client...
Ответ:
The confidence interval for population mean is given by :-
, where
is the sample proportion, n is the sample size ,
is the critical z-value.
The values needed to calculate a confidence interval at the 99% confidence level are :
Given : Significance level :![\alpha:1-0.99=0.01](/tpl/images/0227/0092/0b007.png)
Sample size : n=450
Critical value :![z_{\alpha/2}=2.576](/tpl/images/0227/0092/2c0a6.png)
Sample proportion:![\hat{p}=\dfrac{280}{450}\approx0.62](/tpl/images/0227/0092/8abbb.png)
Now, the 99% confidence level will be :
Hence, the 99% confidence interval is![(0.597,\ 0.643)](/tpl/images/0227/0092/869c2.png)
Ответ:
which table complete the question please!