According to the February 2008 Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft ('Consumer fraud and,' 2008). Assume a state had 303 complaints of identity theft out of 1420 consumer complaints . Calculate a 94% confidence interval for the proportion of all complaints that are complaints of identity theft in that state. P: Parameter What is the correct parameter symbol for this problem? What is the wording of the parameter in the context of this problem? A: Assumptions
- Since information was collected from each object, what conditions do we need to check? Check all that apply.
- σσ is unknown.
- n≥30 or normal population.
- σσ is known.
- n(p̂)≥10
- N≥20n
- n(1-p̂)≥10
Check those assumptions:
1.
2.
3.
If no N is given in the problem, use 1000000
N: Name the procedure
The conditions are met to use a .
I: Interval and point estimate
The symbol and value of the point estimate on this problem are as follows:
= Leave answer as a fraction.
The interval estimate for is ( , )
Round endpoints to 3 decimal places.
C: Conclusion
- We are % confident that is between % and %
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Question 2
Check 0/5 pts Retries 3 Reattempts 99 Info Details
In 2001, the polls found that 81% of American adults believed that there was a conspiracy in the death of President Kennedy. Assume a recent poll asked 1490 American adults if they believe there was a conspiracy in the assassination and it found that 1176 believe there was a conspiracy. Calculate a 98% confidence interval for the percentage of all Americans who believe in this conspiracy.
P: Parameter
What is the correct parameter symbol for this problem?
What is the wording of the parameter in the context of this problem?
A: Assumptions
- Since information was collected from each object, what conditions do we need to check? Check all that apply.
- N≥20n
- n(1-p̂)≥10
- n≥30 or normal population.
- σσ is known.
- σσ is unknown.
- n(p̂)≥10
Check those assumptions:
1.
2.
3.
If no N is given in the problem, use 1000000
N: Name the procedure
The conditions are met to use a
I: Interval and point estimate
The symbol and value of the point estimate on this problem are as follows:
= Leave answer as a fraction.
The interval estimate for is ( , )
Round endpoints to 3 decimal places.
C: Conclusion
- We are % confident that is between % and %
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Question 3
Check 0/5 pts Retries 3 Reattempts 99 Info Details
Assume that last year in a particular state there were 201 children out of 1580 who were diagnosed with Autism Spectrum Disorder. Nationally, 1 out of 88 children are diagnosed with ASD. It is believed that the incident of ASD is more common in that state than nationally. Calculate a 94% confidence interval for the percentage of children in that state diagnosed with ASD.
P: Parameter
What is the correct parameter symbol for this problem?
What is the wording of the parameter in the context of this problem?
A: Assumptions
- Since information was collected from each object, what conditions do we need to check? Check all that apply.
- n(1-p̂)≥10
- N≥20n
- σσ is known.
- n(p̂)≥10
- n≥30 or normal population.
- σσ is unknown.
Check those assumptions:
1.
2.
3.
If no N is given in the problem, use 1000000
N: Name the procedure
The conditions are met to use a .
I: Interval and point estimate
The symbol and value of the point estimate on this problem are as follows:
= Leave answer as a fraction.
The interval estimate for is ( , )
Round endpoints to 3 decimal places.
C: Conclusion
- We are % confident that is between % and %
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Question 4
Check 0/1 pt Retries 3 Reattempts 99 Info Details
A nurse claims that less than 5% of patients are underweight. For which confidence interval should you reject Ho?
- (0.035 to 0.055)
- (0.02 to 0.04)
- (0.049 to 0.051)
- (0.04 to 0.06)
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