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Questions (829)
A researcher at a major clinic wishes to estimate the proportion of the adult population of the US that has sleep deprivation.
3 answers
asked by
SD
1,515 views
The lifetimes of Triple X TV Tubes are approximately normally distributed with mean 13.2 years and standard deviation 3.5 years.
2 answers
asked by
Portia
818 views
the four wealthiest people in a particular country are 46,33,27,15 assume that samples of size n=2 are randomly selected with
1 answer
asked by
tee
665 views
Three firms carry inventories that differ in size. Firm A's inventory contains 2000 items, firm B's inventory contains 5000
3 answers
asked by
megan
1,566 views
A DVD rental store wants to know what proportion of its customers are under age 21. A simple random sample of 500 customers was
2 answers
asked by
Statistics
917 views
A marketing class is engaged in a project to estimate the proportion of homes receiving both HBO and Showtime cable service. The
1 answer
asked by
Leo Elvis
614 views
I took a large sample of households in a city, and based on that, estimate the standard deviation of the income for all
2 answers
asked by
Macy
516 views
If Gallup has used an sis of size n=1021 and obtained the sample proportion p= 0.52 ,you can calculate that the margin of error
1 answer
asked by
ben
375 views
A random sample of size n = 270 is taken from a population with a population proportion p = 0.58. [You may find it useful to
3 answers
asked anonymously
50 views
According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things
2 answers
asked by
LADO
687 views
According to a study conducted by a statistical organization, the proportion of americans who are satisfied with the way things
2 answers
asked by
LADO
967 views
If the mean number of cigarettes smoked by pregnant women is 12 and the standard deviation is 8, find the probability that in a
1 answer
asked by
Octavia
517 views
calculate standard error when sample size is 25, sample mean is 20, sample variance is 8, population mean is 22, population
1 answer
asked by
priym
481 views
A population has a mean of 200 and a standard deviation of 50. Suppose a simple random sample of size 100 is selected and is
1 answer
asked by
lawrence
745 views
Identify the population, and the sample in each of the following:
A small college has 275 tenured full and associate professors.
3 answers
asked by
Terri
1,040 views
A researcher is interested in estimating the average salary of police officers in a large city. She wants to be 95% confident
2 answers
asked by
John
706 views
Suppose that the average amount paid by customers at a grocery store is $80. The standard deviation of the amounts paid is $24.
2 answers
asked by
Ujash
558 views
A sample of comprising 150 members is required from a population comprising 5000 members. It is known that the population falls
1 answer
asked by
Nandy
504 views
what is the margin of error for a simple random sample of 900 people with a standard deviation of 13.5 at 95% level of
2 answers
asked by
Darryl
515 views
ADHD a researcher studying ADHD among teenagers obtains a simple random sample of 100 teenagers aged 13 to 17 and asks them
1 answer
asked by
leslie
746 views
Hi can someone check my answer. I'm not sure why the computer keeps marking it wrong.
**Suppose a random sample of size 50 is
4 answers
asked by
Jen
686 views
How large a sample should be taken if the population mean is to be estimated with 95% confidence to within $69? The population
1 answer
asked by
hanjay
448 views
Researcher wants to estimate the proportion of Canadians that are over the age of 65, accurate to within 2% using a 95%
2 answers
asked by
Farah
491 views
What is the mean of the sample means?
What is the standard deviation of the sample means?
1 answer
asked by
emma
407 views
A can of Coke is supposed to contain, on the average, 16 ounces of soda with a standard deviation of 0.4 ounces. Suspecting
1 answer
asked by
kima
473 views
People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true
2 answers
asked by
Vanessa
850 views
A public relations firm found only 9% of voters in a certain state are satisfied with their US senators. How large a sample of
2 answers
asked by
Nicole
760 views
A _____ is a smaller piece of the population that represents the entire population. (1 point) Responses bias bias interval
3 answers
asked anonymously
62 views
In market research, _____ is defined as the total set of people being observed. (1 point) Responses interval interval statistics
3 answers
asked anonymously
79 views
For an IQ test, we know the population _ 5 100 and the _X 5 16. We are interested in creating the sampling distribution when N 5
3 answers
asked by
Joy
727 views
The All-In-One cable TV network takes a random sample of viewers that watch the network to get their opinion on a new TV show.
1 answer
asked by
bigurl1.4
435 views
A random sample of size n = 32 is taken from a population with mean μ = −6.1 and standard deviation σ = 2. [You may find it
3 answers
asked anonymously
60 views
The Gallup organization conducted a phone survey from June 9-12, 2011. Researchers at Gallup chose a random sample of 1020
7 answers
asked anonymously
59 views
You wish to learn the proportion of MBA students that are female within 3%, and with 98% confidence. How large of a sample
3 answers
asked by
Tesa
565 views
Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each
3 answers
asked by
Anonymous
403 views
Calculate p ̅.
x1 20 n1 50 x2 55 n2 100
1 answer
asked by
jerry
323 views
A random sample of size 26 is to be selected from a population that has a mean ì = 46 and a standard deviation ó of 15.
(f)
1 answer
asked by
Sue 6f
413 views
I have done parts of this question (they are capitalized)which I was hoping someone could double check, and there are other
1 answer
asked by
mysterychicken
863 views
Each sample has n= 5 scores with s2 =38 for the first sample and s2 = 42 for the second. (Note:
Because the two samples are the
1 answer
asked by
diana
450 views
Assume that previous fast-food research has shown that 80 percent of the consumers like curly French fries. The researcher
2 answers
asked by
Donna
1,011 views
A random sample of n=16 scores is obtained from a population with a mean of µ= 80 and a treatment is administered to the
2 answers
asked by
delaney
1,238 views
in a battleground state 60 percent of all voters are republican. assuming there are only 2 parties, democrat and republican, if
1 answer
asked by
yvette
412 views
Suppose that 33 out of 300 selected american drivers read the newspaper while driving. what percent of sample proportions are
1 answer
asked by
jessica
309 views
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If
1 answer
asked by
Alia
951 views
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If
1 answer
asked by
Alia
976 views
6. For Design 3, consider the probability of a random individual in South Dorchester being sampled; and the probability of a
2 answers
asked by
jasonsie
496 views
Thirty five percent of adult americans are regular voters. A random sample of 250 adults in a medium size college town were
2 answers
asked by
Tessa
902 views
a recent study indicated that 29% of the 100 women over age 55 in the study were widows. a. How large a sample must you take to
1 answer
asked by
Tessa
907 views
A beverage comopany uses a machine to automatically fill 1-liter bottles. Assume that the population of volumes is normally
3 answers
asked by
Erica
528 views
The mean height of fully grown birch trees are 18 feet with a standard deviation of 1.2 feet, normally distributed. Random
2 answers
asked by
D
508 views
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