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Confidence intervals
Page 9
Questions (715)
Is this a correct interpretation of a confidence interval: If we were to repeat the procedure of randomly sampling 1,000 UVA
1 answer
asked anonymously
33 views
Find a 95% confidence interval for the true population proportion.
In a survey of 415 adults,59% said that they favored the
1 answer
asked anonymously
25 views
A survey organization takes a simple random sample of 625 households from a city of 80,000 households. On the average, there are
4 answers
asked by
Joyann
1,418 views
A random sample of 250 men yielded 175 who said they'd ridden a motorcycle at some time in their lives, while a similar sample
5 answers
asked by
John
1,394 views
The standard deviation of test scores on a certain achievement test
Is 11.3. If a random sample of 81 students had a sample score
3 answers
asked by
Rami
1,378 views
A test of writing ability is given to a random sample of students before and after they completed a formal writing course. The
3 answers
asked by
heather
1,339 views
A purchasing agent at the Kelly Bread Company wants to estimate the mean daily
usage of rye flour. She takes a sample for 50
3 answers
asked by
Jamie
1,338 views
Consider the trash bag problem. Suppose that an independent laboratory has tested trash bags and has found that no 30-gallon
2 answers
asked by
Amy
1,362 views
We guess, based on historical data, that 30% of graduating high-school seniors in a large city will have completed a first-year
2 answers
asked by
nicole
1,319 views
You are working as an assistant to the dean of institutional research at your university. She wants to survey members of the
2 answers
asked by
Julie Ann
1,311 views
What percentage of college students are attending a college in the state where they grew up? Let p be the proportion of college
4 answers
asked by
Anonymous
1,325 views
A sample of 64 statistics students at a small college had a mean mathematics ACT score of 28 with standard deviation of 4.
2 answers
asked by
Erma
1,288 views
What price do farmers get for their watermelon crops? In the third week of July, a random sample of 51 farming regions gave a
2 answers
asked by
Desperate
1,284 views
1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license
4 answers
asked by
Anonymous
1,274 views
. Wildlife biologists inspect 153 deer taken by hunters and find 32 of them carrying ticks that test positive for Lyme disease.
a
1 answer
asked by
Cutie patootie
1,263 views
Mr. Crandall has assigned a term paper due at the end of the semester. He would like to know the average length of the papers.
4 answers
asked by
Jasmine
1,260 views
The winning team's score in 11 high school basketball games were recorded. If the sample mean is 9.5 points and sample standard
2 answers
asked by
Christi
1,223 views
) Overproduction of uric acid in the body can be an indication of cell breakdown. This may be an advance indication of an
2 answers
asked by
John
1,235 views
A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population
2 answers
asked by
Maureen
1,228 views
5. The following random sample was selected : 4, 6, 3, 5, 9, 3. Find the 95% confidence interval for the mean of the population.
2 answers
asked by
Anonymous
1,215 views
The 112th Congress of the United States of America has 535 members, of which 87 are women. An alien lands near the US Capital
2 answers
asked by
N
1,187 views
a. A statistics practitioner randomly sampled 100 observations from a population with a standard deviation of 5 and found that x
2 answers
asked by
Sally
1,202 views
Suppose a population is sampled and the sample mean is 16.8. The sample standard deviation is 6.0 I am to assume the sample is
1 answer
asked by
Mandi
1,181 views
A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard
2 answers
asked by
Nesa
1,164 views
A simple random sample of 25 has been collected from a normally distributed population for which it is know that o=17.0. The
1 answer
asked by
JOSH
1,146 views
we developed a 95% z confidence interval for the mean BMI of women aged 20 to 29 years, based on a national random sample of 654
2 answers
asked by
steven
1,135 views
These are the only ones that I am having problems with. Please help..
8.You are given the sample mean and the sample standard
3 answers
asked by
Katie
1,109 views
find the 90% confidence interval for the variance and standard deviation of a sample of 16 and a standard deviation of 2.1
2 answers
asked by
Anon
1,102 views
Find the critical values X2 1-a/2 and X2 a/2 for a 95% confidence level and a sample size of n=10.
X2 1-a/2 = X2 a/2 =
2 answers
asked by
Alex
1,088 views
You want to estimate the mean amount spent by customers at a local gas station with 98% confidence and a margin of error of no
2 answers
asked by
Leah
1,102 views
Find the critical values x2L and x2R that correspond to the given confidence level and sample size.
99%: n=23
1 answer
asked by
Kasey
1,100 views
A food snack manu. samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and
2 answers
asked by
Kelly
1,092 views
Use the given confidence level and sample data to find a confidence interval for the population standard sigma. Assume that a
2 answers
asked by
rich
1,082 views
Given a study of 9804 overweight or obese subjects with preexisting cardiovascular disease and/or type 2 diabetes.
Subjects
2 answers
asked by
Help Please
1,095 views
Independent random samples, each containing 800 observations, were selected from two binomial populations. The samples from
1 answer
asked by
Bill
1,074 views
A random sample of size 81 has sample mean 20 and sample standard deviation 3.
(a) Is it appropriate to use a Student’s t
1 answer
asked by
Anonymous
1,067 views
This is my first stats class and I don't know how to do this, could you please help me? Thank you.
You are asked to determine the
1 answer
asked by
Melvin
1,058 views
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study
2 answers
asked by
Patrick
1,049 views
A simple random sample of 25 has been collected from a normally distributed population for which it is known that 17.0. The
2 answers
asked by
Deborah
1,041 views
In a time-use study, 20 randomly selected managers were found to spend a mean of 2.40 hours each day on paperwork. The standard
1 answer
asked by
becky
1,014 views
A 95 confidence interval for the proportion of men that have ever dozed off while driving is 007 to 0.14. For women, a 95%
1 answer
asked by
Sheri
1,005 views
A purchasing agent wants to estimate the mean daily usage of rye flour. She takes a sample for 50 straight days and find that
2 answers
asked by
Lynn
1,024 views
I have no idea how to solve this.
In a sample of 16 students, 15 were right-handed. Can we construct a 95% confidence interval
2 answers
asked by
jessica
980 views
A simple random sample of 60 items resulted in a sample mean of 64. The population standard deviation is 16.
a. Compute the 95%
2 answers
asked by
Anonymous
1,006 views
Speeds for a randomly selected sample of n = 36 vehicles will be recorded. Determine the values that fill in the blanks in the
2 answers
asked by
margie wilcox
984 views
A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 560 college students showed
2 answers
asked by
Jenny K
975 views
A bank officer wants to determine the amount of the average total monthly deposits per customer at the bank. He believes an
1 answer
asked by
Jing Sun Q.
1,031 views
9) A 95% confidence interval for the true mean cholesterol of adult males based on 25 randomly selected subjects extends from
2 answers
asked by
Anonymous
979 views
The average annual cost of the first year of owning and caring for a large dog is $1,843 (US News and World Report, September 9,
1 answer
asked by
Brinlee
948 views
For two normal distributions with the same mean, but different standard deviations, the 95% confidence interval will be:
(a) The
2 answers
asked by
Thano
956 views
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