Question
In: Statistics and Probability
If a 99% confidence level is used, how many people should be included in the survey...
If a 99% confidence level is used, how many people should be included in the survey if the researchers wanted to have a margin of error of 5%?
How would the sample size change if the researchers wanted to estimate the percentage with a margin of error of 3%?
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Expert Solution
Solution:
If a 99% confidence level is used, how many people should be included in the survey if the researchers wanted to have a margin of error of 5%?
Where:
is the critical value at the 0.01 significance level.
How would the sample size change if the researchers wanted to estimate the percentage with a margin of error of 3%?
Answer:
orchestra answered 2 years agoRelated Solutions
A 95% confidence interval contains 5. If the confidence level is increased to 99%, will the...
A 95% confidence interval contains 5. If the confidence level is
increased to 99%, will the new interval contain 5?
Yes
No
Unable to determine
1. If you decrease the level of confidence from 99% to 95%, the width of confidence...
1. If you decrease the level of confidence from 99% to 95%, the
width of confidence interval will A. increase by 4% B. decrease by
4% C. decrease by 8% D. None of the above
2. If you wish to decrease the margin of error, you may do which
one of the following: A. Increase the sample size. B. Reduce the
population size. C. Decrease the level of confidence.
D. Both b and c E. Both a and c
3. In...
Multiple choice 1.If a confidence interval is constructed at a confidence level of 99% instead of...
Multiple choice
1.If a confidence interval is constructed at a confidence level
of 99% instead of 95%
a.Estimation precision decreases
b.The precision of the estimate is not altered
c.Estimation accuracy improves significantly
d.We can accurately calculate the value of the parameter of
interest
2.The confidence level in a confidence interval represents:
a.The probability that that particular interval contains the true
value of the parameter
b.How sure we are of having correctly estimated the parameter
c.None of the options exposed
d.The...
A. How many samples do you need to create a 99% confidence interval for u with...
A. How many samples do you need to create a 99% confidence
interval for u with a margin of error fo 10 and standard deviation
of 28?
B. Five a 95% percent confidence interval for the true mean if
the sample mean is 86.5, the sample size is 70, and the standard
deviation is 12.2.
A. How many samples do you need to create a 99% confidence interval for u with...
A. How many samples do you need to create a 99% confidence
interval for u with a margin of error fo 10 and standard deviation
of 28?
B. Five a 95% percent confidence interval for the true mean if
the sample mean is 86.5, the sample size is 70, and the standard
deviation is 12.2.
If the confidence level is increased from 90% to 99% for a simple random sample of...
If the confidence level is increased from 90% to 99% for a
simple random sample of size n, the width of the confidence
interval for the mean μ will:
Question 1 options:
The answer cannot be determined from the information given.
decrease.
stay the same.
increase.
A psychologist is interested in constructing a 99% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 99% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 57 of the 708 randomly selected people who were
surveyed agreed with this theory. Round answers to 4 decimal places
where possible. a. With 99% confidence the proportion of all people
who accept the theory that a person's spirit is no more than the
complicated...
A psychologist is interested in constructing a 99% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 99% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 56 of the 754 randomly selected people who were
surveyed agreed with this theory.
a. With 99% confidence the proportion of all people who accept
the theory that a person's spirit is no more than the complicated
network of neurons in the brain is between___...
A psychologist is interested in constructing a 99% confidence interval for the proportion of people who...
A psychologist is interested in constructing a 99% confidence
interval for the proportion of people who accept the theory that a
person's spirit is no more than the complicated network of neurons
in the brain. 68 of the 823 randomly selected people who were
surveyed agreed with this theory. Round answers to 4 decimal places
where possible.
a. With 99% confidence the proportion of all people who accept
the theory that a person's spirit is no more than the complicated...
in a survey of 2290 adults, 717 say they believe in UFO's construct a 99% confidence...
in a survey of 2290 adults, 717 say they believe in UFO's
construct a 99% confidence interval for the population
proportion of adults who believe in UFOS
a 99% confidence level for the population proportion is ( , )
round to three decimals.
interpret your results. Choose correct answer below.
A. with 99% probability the population proportion of adults who
do not believe in UFOS is between the endpoints of the given
confidence interval.
B. with 99% confidence it can...
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