Question

a) If n=390 and ˆpp^ (p-hat) =0.88, find the margin of error at
a 99% confidence level

Give your answer to three decimals

b)Out of 200 people sampled, 44 had kids. Based on this,
construct a 99% confidence interval for the true population
proportion of people with kids.

Give your answers as decimals, to three places

c) If n=25, ¯xx¯(x-bar)=32, and s=2, construct a confidence
interval at a 90% confidence level. Assume the data came from a
normally distributed population.

Give your answers to one decimal place.

Answer #1

a. z value for 99% CI is 2.576 as P(-2.576<z<2.576)=0.99

So Margin of Error is

b. z value for 99% CI is 2.576 as P(-2.576<z<2.576)=0.99

So Margin of Error is

So CI is

c. t table value for 90% is TINV(0.1,24)=1.711

So Margin of Error is

So CI is

If n=280 and ˆpp^ (p-hat) =0.71, find the margin of error at a
99% confidence level
Give your answer to three decimals

If n=440 and ˆpp^ (p-hat) =0.75, find the margin of error at a
99% confidence level.
As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.
Give your answer rounded to three decimal places.

If n=410 and ˆpp^ (p-hat) =0.41, find the margin of error at a
95% confidence level
Give your answer to three decimals

If n=160 and ˆpp^ (p-hat) =0.28, find the margin of error at a
90% confidence level
Give your answer to three decimals

If n=460 and ˆpp^ (p-hat) =0.52, find the margin of error at a
95% confidence level
Give your answer to three decimals

If n=210 and ˆpp^ (p-hat) =0.74, find the margin of error at a
90% confidence level
Give your answer to three decimals
Submit Question

If n = 320 and ˆpp^ (p-hat) = 0.05, construct a 90% confidence
interval.
Give your answers to three decimals
_< p >_

If n=410 and ˆp (p-hat) =0.32, find the margin of error at a 99%
confidence level
=_____________ Give your answer to three decimals

Out of 100 people sampled, 80 had kids. Based on this, construct
a 99% confidence interval for the true population proportion of
people with kids.
Give your answers as decimals, to three places

Out of 300 people sampled, 78 had kids. Based on this, construct
a 99% confidence interval for the true population proportion of
people with kids.
Give your answers as decimals, to three places
_________ < p <_________

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