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Confidence Interval
Page 4
Questions (364)
A sample of 15 recent college graduates found that starting salaries for attorneys in New York City had a mean of $102,342 and a
3 answers
asked by
Mark
1,479 views
Twenty randomly selected students took the statistics final. If the sample mean was 88 and the ó =5.2, construct a 95%
2 answers
asked by
Sherry
545 views
A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of
1 answer
asked by
Jason
342 views
A researcher is interested in whether students who attend private high schools have higher average SAT Scores than students in
3 answers
asked by
Tony
783 views
A random sample of greeting cards is a mean value of $2.55 and a standard deviation of $0.44 So construct a 95% confidence
1 answer
asked by
Vicki
417 views
A studyis run to estimate the mean total cholesterol level in children 2 to 6 years of age. A sample of 9 participants is
2 answers
asked by
natasha
629 views
The width of the Confidence Interval is inversely related to the Maximum Error of Estimate. T or F? Why or why not?
2 answers
asked by
Jen
724 views
Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation:
z(α/2) = 1.96
2 answers
asked by
Jen
514 views
A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of
3 answers
asked by
CS
396 views
An investor wants to determine the true average yield on a selection of investments from the Business week 1000. Suppose the
1 answer
asked by
Angela
364 views
An environmental survey contained a question asking what respondents
thought was the major cause of air pollution in this
1 answer
asked by
Alex
478 views
how to work this math problemAn archaeologist has 250 animal bone fragments from prehistoric site -of these 195 are white-tail
1 answer
asked by
Donna
382 views
simple random sample of 50 women on new product of the 50 women, 60% reported they like the new product, fina a 90% confidence
1 answer
asked by
Vicky
430 views
3. Piyush, who had joined the infrastructure department of the bank, was asked to estimate the rental value of commercial
1 answer
asked by
prakash
376 views
A survey of an urban university (population of 25,450) showed that 750 of 1100 students sampled attended a home football game
3 answers
asked by
samantha
733 views
Find the 90% confidence interval for the variance and the standard deviation of the ages of seniors at Oak Park College if a
4 answers
asked by
bjacobs
921 views
To help consumers assess the risks they are taking, the Food and Drug Administration (FDA) publishes the amount of nicotine
3 answers
asked by
Roger
964 views
. An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within one
4 answers
asked by
minhaj
1,634 views
A study of elephants wishes to determine the average weight of a certain subspecies of elephants. The standard deviation of the
1 answer
asked by
Anonymous
636 views
If a confidence interval for the mean is 24.8 < ì < 29.6. What is the margin of error?
1 answer
asked by
Erica
319 views
For a sample of 200 patients diagnosed with allergies, 25 were men. What is the 90% confidence interval for the population
3 answers
asked by
Lori
301 views
12- The number of cars sold annually by used car salespeople is normally distributed with a standard deviation
of 19.22. A random
1 answer
asked by
Judy and group
645 views
A random sample of 40 men drank an average of 20 cups of coffee per week during examination final,
with the population standard
3 answers
asked by
cindy
1,065 views
There are 1000 students in the University of A. A sample of 10 observations was obtained regarding the rating of the service
3 answers
asked by
JL
391 views
A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a sample is needed in order to
2 answers
asked by
Melanie
770 views
In response to media inquiries and concerns expressed by groups opposed to violence, the president of a university with over
1 answer
asked by
Tonya
491 views
In response to media inquiries and concerns expressed by groups opposed to violence, the president of a university with over
1 answer
asked by
Josephine
1,045 views
A. The 95% confidence interval is:
(a) Larger than the 99% confidence interval (b) Smaller than the 99% confidence interval (c)
2 answers
asked by
Jox
495 views
What is Confidence Interval? Is it better to have a large Confidence Interval or a small Confidence Interval? Briefly explain.
1 answer
asked by
biology
501 views
A sample statistic and margin of error are given. Find the confidence interval likely to contain the population parameter of
3 answers
asked anonymously
42 views
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x
, is found to
1 answer
asked anonymously
62 views
A time study od a certain service task found a average cycle time of 15 minutes, with a standard deviation of 5 minutes. These
2 answers
asked by
D.Martin
667 views
It is known that the amount of time needed to change the oil in a car is normally distributed with a standard deviation of 5
1 answer
asked by
Jason L
664 views
Suppose that, based on a simple random sample of n = 100 American adult men, we wish to calculate a 98% confidence interval for
6 answers
asked anonymously
47 views
A lawyer researched the average number of years served by 45 different justices on the Supreme Court. The average number of
1 answer
asked anonymously
39 views
Which type of confidence interval should you use in this situation? An economics professor randomly selected 100 millionaires in
1 answer
asked anonymously
31 views
Which of the following would increase the width of a confidence interval?
Changing from a 99% to 95% confidence level. Increasing
4 answers
asked by
Susie
3,871 views
In a study designed to test the effectiveness of magnets for treating back pain, 40 patients were given a treatment with magnets
3 answers
asked by
Sharie
3,473 views
Twelve different video games showing substance use were observed and the duration times of game play ( in seconds) are listed
3 answers
asked by
Angel
3,107 views
A car manufacturer is interested in conducting a study to estimate the mean stopping distance for a new type of brakes when used
3 answers
asked by
Bob
2,731 views
The 95% confidence interval is:
(a) Larger than the 99% confidence interval (b) Smaller than the 99% confidence interval (c) The
5 answers
asked by
Thano
2,353 views
Professor York randomly surveyed 240 students at Oxnard University, and found that 150 of the students surveyed watch more than
4 answers
asked by
Angela
2,182 views
A study of 40 bowlers showed that their average score was 186. The standard deviation of the population is 6. Find the 95%
4 answers
asked by
Greg
2,148 views
Computer Depot is a large store that sells and repairs computers. A random sample of 110 computer repair jobs took technicians
4 answers
asked by
Jasmine
1,835 views
You have an SRS of 15 observations from a Normally distributed population. What critical value would you use to obtain a 98%
3 answers
asked by
UCI STUDENT
1,784 views
A college professor believes that students take an average of 15 credit hours per semester. A random sample of 24 students in
4 answers
asked by
Dorothy
1,745 views
Determine the level of the confidence given the confidence coefficient z(α/2) for the following situation: z(α/2) = 1.96
3 answers
asked by
slomomo
1,696 views
a recent survey of 8 randomly selected social networking sites has a mean of 13.1 million visitors for a specific month. the
3 answers
asked by
chris
1,593 views
A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than
2 answers
asked by
S
1,558 views
Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size n=10 or n=20, is the confidence
4 answers
asked by
Morgan
1,520 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