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Confidence Interval
Page 2
Questions (364)
Find the 95% confidence interval for the standard deviation of the lengths of pipes if a sample of 26 pipes has a standard
4 answers
asked by
Anonymous
1,709 views
1) A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10.
4 answers
asked by
McKenzie
3,237 views
A simple random sample of 50 items from a population with σ � 6 resulted in a sample
mean of 32. a. Provide a 90% confidence
4 answers
asked by
priyanka
3,157 views
Which of the following statements correctly interprets a 95% confidence interval on a population mean?
a. It is a single point
3 answers
asked by
Beata Chmielewska
1,234 views
Confidence interval
3 answers
asked by
Elizabeth
45 views
A large health care system gave all nurses a flat wage increase. A union representative sampled 50 nurses and found that the
2 answers
asked by
Daniel
644 views
The following data represent the asking price of a simple random sample of homes for sale. Construct a 99% confidence interval
4 answers
asked by
LADO
1,570 views
A group of 49 randomly selected construction workers has a mean age of 22.4 years with a standard deviation of 3.8. According to
3 answers
asked by
Cheryl
2,007 views
A survey of 90 families showed that 40 owned at least one gun. Find the 95%
confidence interval of the true proportion of
4 answers
asked by
Jodene
1,155 views
When estimating a population mean μ, where the population standard deviation σ is known, we can:
a. choose a larger z value,
2 answers
asked by
Melanie
1,291 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
3 answers
asked by
jamie
1,904 views
The Pew Research Center recently polled n= 1048 U.S drivers andfound that 69% enjoyed driving their automobiles.
(a) Construct a
3 answers
asked by
Cassandra
1,351 views
1. A state’s department of education reports that 12% of the high school students in that state attend private schools. The
3 answers
asked by
fast eddie
2,109 views
In order to make sure that their bags of chips are of sufficient weight, the Chipper Chip Company try to fill their 200 gram
2 answers
asked by
lollzzz
560 views
44) A financial institution wishes to estimate the mean balances owed by its credit card customers. The population standard
3 answers
asked by
BC
592 views
n=97,x=46;98% confidence
3 answers
asked by
audrey
1,049 views
A small computing center has found that the number of jobs submitted per day to its computers has a distribution that is
2 answers
asked by
AOL
55 views
To determine the views of a students on a particular campus about fraternities, an 11-point attitude scale was administered to a
3 answers
asked by
Taylor
1,465 views
The test marks for 29 students studying STSA 1624 produced a mean of 72,8% and a variance of 275,56%. If the distribution of the
2 answers
asked anonymously
48 views
A ramdom sample of 150 workers showed that 90 workers are satisfied with the new medical scheme. Find a 90% confidence interval
2 answers
asked anonymously
44 views
A ramdom sample of 150 workers showed that 90 workers are satisfied with the new medical scheme. Find a 90% confidence interval
2 answers
asked anonymously
55 views
the masses of 6 containers of Chow dog food are:
9.8 10.4 9.8 10 10.2 9.6 Find a 99% confidence interval for the mean mass of all
2 answers
asked anonymously
37 views
A recent survey of 81 customers who frequently visit convenient stores in Kimberly found that the mean value of purchases was R
2 answers
asked anonymously
45 views
Light bulbs supplied by a certain company have a length life that is approximately normally distributed, with the standard
2 answers
asked anonymously
60 views
8. The following regression equation for quantity supplied was estimatedusing a
sample of fifty observations. Q = 2.2 + 0.104P.
1 answer
asked by
Esther
98 views
1.Leana is interested in the proportion of people who live in her area who own a dog. She randomly selects 50 addresses within a
1 answer
asked by
Sweet pea
253 views
The confidence interval for a population mean has a margin of error of .075 determine the length of the confidence interval
1 answer
asked by
Genesis
187 views
The mean per capita income is 24,787 dollars per annum with a variance of 169,744. What is the probability that the sample mean
2 answers
asked by
Rhodey
515 views
Suppose that a random sample of five observations was taken from a normal population whose
variance is 25. The results are 8, 15,
1 answer
asked by
jhon kells
344 views
In a 95% Confidence Interval, the true mean has what chance of falling between the Lower
Limit and Upper Limits of the calculated
1 answer
asked by
mona
733 views
The weight of adults in a certain city has a mean of 130 lbs, with a standard deviation of 41 lbs. A sample of 25 adults living
1 answer
asked by
Mamaru
360 views
Direct mail advertisers send solicitations ("junk mail") to thousands of potential customers in the hope that some will buy
1 answer
asked by
Anonymous
960 views
In a study of the relationship between pet ownership and physical activity in older adults, 575 subjects reported that they
1 answer
asked by
YOMO
462 views
In a random sample of 200 registered voters, 150 indicated they are Democrats. Develop a 99% confidence interval for the
2 answers
asked by
nancy
677 views
to estimate p, the proportion of all newborn babies who are male, the gender of 10,000 newborn babies was noted. if 5106 were
3 answers
asked by
john
632 views
According to a survey by Topez Enterprises, a travel auditing company the avg error by travel agent is 128. suppose this figure
1 answer
asked by
Karan
450 views
Visitor Numbers
Total visitors: 2004. 2005. 2006 3,135,727. 3,164,906. 3,281,435 Total visitor days: 2004. 2005. 2006 7,453,465.
1 answer
asked by
Candice
649 views
Table 9: Visitor Numbers
Total visitors: 2004. 2005. 2006 3,135,727. 3,164,906. 3,281,435 Total visitor days: 2004. 2005. 2006
1 answer
asked by
Candice
513 views
Table 9: Visitor Numbers
Total visitors: 2004. 2005. 2006 3,135,727. 3,164,906. 3,281,435 Total visitor days: 2004. 2005. 2006
2 answers
asked by
Candice
595 views
(a) An insurance company wants to estimate the proportion of people unsatisfied with their new telephone help service. A survey
1 answer
asked by
Laurence
385 views
A manufacturing company wishes to estimate the number of items that its workforce can produce on average each hour now that they
1 answer
asked by
Sam
481 views
A car manufacturing company is interested in finding the average fuel consumption of one of its new models Leopard F-type.
1 answer
asked by
Anonymous
454 views
Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation
2 answers
asked by
Albert
865 views
For 30 randomly selected Rolling Stones concerts, the mean gross earnings is 2.37 million dollars. Assuming a population
1 answer
asked by
Lala
615 views
What is a 95% confidence interval for the time my colleagues can stay awake on average for all of my colleaguesWhat is a 95%
2 answers
asked by
kish
502 views
The manager of Lone Star Restaurant believes that the average wait time of the Saturday evening meal is 30 minutes. To test this
2 answers
asked by
Lucy
590 views
Let θ be an unknown constant. Let W1,…,Wn be independent exponential random variables each with parameter 1. Let Xi=θ+Wi.
Wha
2 answers
asked by
qwerty
607 views
Let θ be an unknown constant. Let W1,…,Wn be independent exponential random variables each with parameter 1. Let Xi=θ+Wi.
Wha
10 answers
asked by
Fire
779 views
In a random sample of 63 women at a company, the mean salary is $48,902 with a standard deviation of $5270. In a random sample
2 answers
asked by
sweet12
622 views
In a random sample of 63 women at a company, the mean salary is $48,902 with a standard deviation of $5270. In a random sample
1 answer
asked by
sweet12
786 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
Mathematics/Statistics
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
Survey analysis
Visitor Numbers