Calculating confidence interval for proportions
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An interactive poll found out that 330 adults of 2,396 adults over the age of 18 have at least 1 tattoo.
A) Obtain a point estimate of the proportion of adults that have at least 1 tattoo. p̂=____?
B) Construct a 90% confidence interval for the proportion of adults that have at least 1 tattoo. Select the correct choice below and if necessary fill in the blanks
a) Lower bound ___________ Upper bound ________________ round to three decimal places
b) The requirements for conducting a confidence interval are not satisfied.
C) Construct a 99% confidence interval for the proportion of adults that have at least 1 tattoo. Select the correct choice below and if necessary fill in the blanks
a) Lower bound ___________ Upper bound ________________ round to three decimal places
b) The requirements for conducting a confidence interval are not satisfied.
D) Choose the correct answer below
a) Increasing the level of confidence has no effect on the interval
b) Increasing the level of confidence narrows the interval
c) Increasing the level of confidence widens the interval
d) It is not possible to tell the effect of increasing the level of interval of confidence width of the interval since
the requirements for constructing a confidence interval in parts a and b were not met.
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This posting explains how to calculate confidence interval for proportion.
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An interactive poll found out that 330 adults of 2,396 adults over the age of 18 have at least 1 tattoo.
A) Obtain a point estimate of the proportion of adults that have at least 1 tattoo. p̂=____?
Solution:
p = 330/2396 = 0.1377
Answer: 0.1377
B) Construct a 90% confidence interval for the proportion of adults that have at least 1 tattoo. Select the correct choice below and if necessary fill in the blanks
a) Lower bound ___________ Upper bound ...
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