Con?dence interval for unknown proportion

Reference no: EM131011915

1. What's wrong? Explain what is wrong with each of the following:

(a) An approximate 99% con?dence interval for an unknown proportion p is pˆ plus or minus its standard error.

(b) When performing a large-sample signi?cance test for a population proportion, the t distribution is used to compute the P-value.

2. pˆ and the Normal distribution. Consider the binomial setting with n = 60 and p = 0.4.

(a) The sample proportion pˆ will have a distribution that is approximately Normal. Give the mean and the standard deviation of this Normal distribution.

(b) Draw a sketch of this Normal distribution. Mark the location of the mean.

Reference no: EM131011915

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