Question

Suppose you wish to determine the true proportion of the population that supports marijuana legalization. You poll a randomly selected sample of 400 individuals and find 61% of them support legalization.

(a) What is your point estimate for the proportion?

(b) Show that the success/failure conditions hold.

(c) Find the standard error for this estimate.

(d) Compute a 95% confidence interval for this estimate. (e) Compute a 99% confidence interval for this estimate.

Answer #1

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Suppose we wish to make
an estimate of the proportion of the population that has a learning
disability. We take a random sample of 100
people. In this sample, 15% of the respondents have a
learning disability.
1. Construct a
95% confidence interval for the proportion of people in the
population who have a learning disability.
2. Interpret,
in words, the meaning of this
interval.

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population proportion, what affects the size of the margin of
error?
A. The sample size
B. The sample proportion
C. The confidence level
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E. None of the above affect the size of the margin of error
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a) Is it possible to compute an estimate of ? from this data
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error using the confidence level 0.95

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