In a sample survey, 138 students failed the exam out of 200 total students.  1. Calculate the 95% confidence interval for the population prportion of students who failed the exam.  2. Compare the margin of errors at 90%, 95%, and 99% confidence intervals. What happens when the confidence interval increases?

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A: Givenn=374x=157p^=xn=157374=0.41981-p^=1-0.4198=0.5802α=1-0.90=0.1α2=0.05Z0.05 =1.645

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Q: Use the information to construct 90% and 99% confidence intervals for the population mean. Interpret…

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Q: 14. Direct Mail A survey shows that 51% of adults prefer to receive advertisements through the mail.…

A: Given percent of adults prefer to receive advertisements through the mail=51%Margin of error(E)=5.2%

Q: 1. How is the expected length of a confidence interval related to the margin of error?

A: here use basic of confidence interval

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A: given data N =3500n = 280x = 56claim : p = 0.30

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A: Given Information: x1=45n1=85x2=20n2=65c=90%=0.90

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A: From the provided information, Confidence level = 98% Margin of error (E) = 4% Since, the value of p…

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Q: Which of the following will decrease the confidence interval width for the population mean?   A)…

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Q: survey of 2269 ​adults, 701 say they believe in UFOs.   Construct a 95% confidence interval for the…

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Q: Example:  You would like to construct a 90% confidence interval for the proportion of graduating…

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Q: Translate the statement into a confidence interval. Approximate the level of confidence. In a survey…

A: as per our company guidelines we are supposed to answer only first question. Kindly repost other…