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Confidence Interval
Page 6
Questions (364)
An online site presented this question, 'Would the recent norovirus outbreak deter you from taking a cruise?' Among 34,327
1 answer
asked by
slomomo
750 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
Alison
767 views
Find a 95% confidence interval for the true population portion.
In a survey of 319 female employees of a large company, 29% said
1 answer
asked by
Deb
765 views
To determine how many hours per week freshmen college students watch television, a random sample of 225 students was selected.
2 answers
asked by
M.C
770 views
A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license
2 answers
asked by
Anonymous
755 views
With a confidence level of .95 and a confident interval of 5 and a
population of 20,000 what is the sample size? With a
1 answer
asked by
sam
739 views
The human resources department of a consulting firm gives a standard creativity test to a randomly selected group of new hires
1 answer
asked by
Ruth
744 views
A researcher wishes to estimate the mean weekly wage of the several hundreds of workers employed
by a certain firm within
2 answers
asked by
katie
753 views
A sample of 40 CDs from a student's collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes.
2 answers
asked by
Anonymous
744 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
2 answers
asked by
vickie
723 views
A random sample of 100 students from a high school was selected. If a 98% confidence interval estimate for the mean age of
2 answers
asked by
zac
735 views
1. A simple random sample of 400 students is taken at a large university. The average height of the sampled students is 68
1 answer
asked by
Anonymous
720 views
A random sample of 14 evenings at the O'Sullivan house hold showed that the family received an average of 2.4 solicitation calls
1 answer
asked by
Jasmine
719 views
11. A local health care company wants to estimate the mean weekly elder day care cost. A sample of 10 facilities shows a mean of
2 answers
asked by
tristen
682 views
A filing machine designed to fill soda bottles with 16 ouncesof soda. The distribution for the weight of the bottles is normal.
2 answers
asked by
Leslie Meagan
685 views
Quality Progress, February 2005, reports on the results achieved by Bank of America in improving customer satisfaction and
2 answers
asked by
Steve
677 views
You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a
2 answers
asked by
robyn
670 views
In a study designed to test the effectiveness of magnets for treating back pain, 35 patients were given a treatment with
2 answers
asked by
Kyra
667 views
The National Center for Education surveyed 4400 college graduates about the lengths of time required to earn their bachelor's
2 answers
asked by
katy
655 views
A medical researcher wants to determine whether male pulse rates vary more or less than female pulse rates. Using the sample
1 answer
asked by
josh
685 views
A researcher wants to estimate the mean blood cholesterol level of young men ages 15-25 with a 97.59% confidence interval. The
1 answer
asked by
Princess
664 views
n a hospital 24 operating rooms were sampled. The mean noise level was 41.6 decibels and the standard deviation was 7.5. What is
3 answers
asked by
Tony
676 views
A researcher found a sample proportion of 0.94 for estimating the population proportion of freshmen at a university who had
2 answers
asked by
Mary
676 views
A survey of an urban university (population of 25,450) showed that 878 of 1,119 students sampled supported a fee increase to
3 answers
asked by
Ray
655 views
B) A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4Kilometers per liter with a standard
2 answers
asked by
joe
652 views
An IQ test was administered to a random sample of 26 mental patients and the mean was found to be 99.7. For this test, the
2 answers
asked by
Anonymous
651 views
Each of the following is a confidence interval for u = true average(population mean) resonance frequency (Hz) for all tennis
1 answer
asked by
joe
651 views
The trends in international mathematic and science study (TIMSS) in 2007 examined eighth grade proficiency in math and science.
2 answers
asked by
Marc
651 views
test the hypothesis that the average height of a male in USA is greater than 5'10 and the average height of a female is less
2 answers
asked by
Lynn
620 views
a study of 40 professors showed they spent on average 13.6 minutes correcting a student papers. Given a standard deviation of
2 answers
asked by
Emmanuel
627 views
A random sample of 14 college female students revealed their average height was 66.1 inches.
a) How many students should be in a
1 answer
asked by
Kasey
631 views
The U.S. Dairy Industry wants to estimate the mean yearly milk consumption. A sample of 20 people reveals the mean yearly
1 answer
asked by
Anonymous
610 views
Find the 95% confidence interval for the difference between two means based on this information about two samples. Assume
6 answers
asked by
Tracy
635 views
The Maximum Error of Estimate is exactly equal to half of the width of the confidence interval. T-F, and why or why not?
2 answers
asked by
sharon
586 views
interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard
3 answers
asked by
Anonymous
620 views
A company is considering offering child care for their employees. They wish to
estimate the mean weekly child-care cost of their
4 answers
asked by
Monica
623 views
It is known that the population mean for the Full Scale IQ of the WAIS is 100 with a standard deviation of 15. A researcher
2 answers
asked by
Katie
617 views
In a survey of 633 males ages 18-64, 395 say they have gone to the dentist in the past year. Construct 90% and 95% confidence
1 answer
asked by
Anonymous
605 views
A 99% confidence interval for population variance is being formulated based on a sample of 16 observations. What are appropriate
2 answers
asked by
Sandy
587 views
An online site presented this question, 'Would the recent norovirus outbreak deter you from taking a cruise?' Among 34,327
2 answers
asked by
jeedo
587 views
An online site presented this question, 'Would the recent norovirus outbreak deter you from taking a cruise?' Among the 34
2 answers
asked by
Roberts
572 views
Given the information: the sampled population is normally distributed, = 10.4, n = 60, and = 81.2.
a. Find the 98% confidence
3 answers
asked by
ks
586 views
Thirty random students took a calc test. If the sample mean was 90 & the standard deviation was 13.9, construct a 99% confidence
2 answers
asked by
Shannon
566 views
14) You wish to compare the average GPA of students from one department to another. It is assumed that the distributions of GPA
2 answers
asked by
ronaldo
571 views
What is a 95% confidence interval for mue, the population mean time the postal service employees have spent with the postal
2 answers
asked by
Stephanie
593 views
Use the sample data and confidence level to construct the confidence interval estimate of the population p....n=5200, x=4821,
2 answers
asked by
Tangee
588 views
a companys ceo wanted to estimate the percentage of defective product per shipment. in a sample contianing 600 products he found
2 answers
asked by
crystal
585 views
Should companies use the same confidence interval each time a confidence interval is determined or should the level change based
2 answers
asked by
John
583 views
Suppose you are told that a 95% confidence interval for the average price of a gallon of regular gasoline in your state is from
2 answers
asked by
Alice
568 views
A sample of 120 bags of potatoes produced by a factory was found to have a mean weight of
2.47 kg and a standard deviation of
2 answers
asked by
Grace
571 views
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Parent Categories (35)
Blood Plasma Volume
Data Analysis
Data Analysis/Inferential Statistics
Descriptive Statistics
Estimation
Hypothesis Testing
Inference
Inferential Statistics
Mathematics and Statistics
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Maximum Likelihood Estimation
Normal Distribution
One-sample t-test
Population mean and sample mean
Population Mean and Standard Deviation
Population Proportion
Population Sampling
Probability
Probability and Statistics
Sample Mean
Sample size calculation
Sample Size Estimation
Sampling
Sampling and Estimation
Sampling and Sampling Distributions
Sampling and Surveys
Sampling Methods
Sleeping bags
Statistical Analysis
Statistical Inference
Statistical Measures
Statistics
Statistics and Probability
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