Confidence Intervals Proportions

If p-hat is 0.4 and the SD of the sampling dist. is 0.07, which of the following is the 90% confidence interval for p?

Find the critical value for a 94% confidence interval.

1.96 is the ______________ for a 95% confidence interval.

Each sample of the same size from a population will produce the same confidence interval.

 Suppose a 99% confidence interval for p is 0.35 < p < 0.45.  What is p-hat?

X-bar is the the point estimate for μ.

Suppose a 95% CI for p is 0.2 < p < 0.8.  What is E?

You create an 80% CI and a 90% CI for p from a sample of size 30. Which interval is wider?

What is the probability that a 95% confidence interval for μ actually contains μ? 

A confidence interval is a way to use a __________ to estimate a ___________.

.3<μ<.5 is a 99% CI for the proportion of students who spend more than $10 at lunch. Which is a correct interpretation?

(0.55, 0.67) is a 95% CI for the prop. of people who will vote for a candidate. If there are 100,000 voters...

z_c is a value from the standard normal distribution such that P(-z_c < z < z_c) = c.

As the sample size __________________, the width of the confidence interval ________________.

How does the confidence level affect margin of error?

A larger sample size produces a wider confidence interval.