Question

In a random sample of 830 adults in the U.S.A., it was found that 84 of those had a pinworm infestation. You want to find the 95% confidence interval for the proportion of all U.S. adults with pinworm.

(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? **Round your answer to 3 decimal
places.**

(b) Construct the 95% confidence interval for the proportion of all
U.S. adults with pinworm. **Round your answers to 3 decimal
places.**

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(c) Based on your answer to part (b), are you 95% confident that
more than 6% of all U.S. adults have pinworm?

Yes, because 0.06 is below the lower limit of the confidence interval.

No, because 0.06 is above the lower limit of the confidence interval.

No, because 0.06 is below the lower limit of the confidence interval.

Yes, because 0.06 is above the lower limit of the confidence interval.

(d) In Sludge County, the proportion of adults with pinworm is found to be 0.15. Based on your answer to (b), does Sludge County's pinworm infestation rate appear to be above the national average?

No, because 0.15 is above the upper limit of the confidence interval.

Yes, because 0.15 is below the upper limit of the confidence interval.

No, because 0.15 is below the upper limit of the confidence interval.

Yes, because 0.15 is above the upper limit of the confidence interval.

Answer #1

In a random sample of 830 adults in the U.S.A., it was found
that 84 of those had a pinworm infestation. You want to find the
95% confidence interval for the proportion of all U.S. adults with
pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal
places.
(b) What is the critical value of z (denoted
zα/2) for a 95% confidence interval?
Use the value from the...

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infestation. You want to find the 99% confidence interval for the
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(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal
places.
(b) Construct the 99% confidence interval for the proportion of all
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(a) What is the point estimate for the proportion of all U.S.
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(b) What is the critical value of z (denoted
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Use the value from...

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(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal places.
(b) What is the critical value of z (denoted zα/2) for a 95%
confidence interval? Use the value from...

Pinworm: In a random sample of 790 adults in the U.S.A., it
was found that 76 of those had a pinworm infestation. You want to
find the 99% confidence interval for the proportion of all U.S.
adults with pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal places.
(b) What is the critical value of z (denoted zα/2) for a 99%
confidence interval? Use the value...

In a random sample of 780 adults in the U.S.A., it was found
that 76 of those had a pinworm infestation. You want to find the
99% confidence interval for the proportion of all U.S. adults with
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(a) What is the point estimate for the proportion of all U.S.
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Corn: In a random sample of 84 ears of corn, farmer Carl finds
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(a) What is the point estimate for the proportion of all of
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(b) What is the critical value of z (denoted zα/2) for a 90%
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that 14 of them have worms. He wants to find the 95% confidence
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(a) What is the point estimate for the proportion of all of
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places.
(b) What is the critical value of z (denoted zα/2) for a 95%
confidence interval? Use the value from...

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