Tuesday

October 21, 2014

October 21, 2014

Posted by **George** on Wednesday, May 5, 2010 at 7:02pm.

a) Find the point estimate for the population proportion , p , of those concerned about getting the flu.

b) Construct a 90% Confidence Interval for the population proportion.

c) How big a sample size would be needed to allow for a 2% margin of error?

- Statistics -
**MathGuru**, Wednesday, May 5, 2010 at 9:33pmUse a proportional confidence interval formula.

CI90 = p + or - (z-value)(√ pq/n)

Find z-value using a z-table representing 90%. p = 643/1037 (convert to a decimal). q = 1 - p. n = 1037 (sample size). Plug values into the formula and calculate the interval.

Formula to find sample size:

n = [(z-value)^2 * p * q]/E^2

... where n = sample size, z-value is the same as above, p and q are the same as above, ^2 means squared, * means to multiply, and E = .02 (for 2%).

Plug values into the formula and calculate n.

I hope this will help get you started.

**Answer this Question**

**Related Questions**

Statistics - In a survey of 1037 adults from the United States age 65 and over, ...

Statistics - One of the questions in the Pew Internet & American Life Project ...

Basic Statistics - Historically, the proportion of adults over the age of 24 ...

Statistics Emergency please - People end up tossing 12% of what they buy at the ...

Statistics - People end up tossing 12% of what they buy at the grocery store (...

statistics - People end up tossing 12% of what they buy at the grocery store (...

statistics - People end up tossing 12% of what they buy at the grocery store (...

Statistics - In a survey of 633 males ages 18-64, 395 say they have gone to the...

Introduction to statistics - A researcher would like to estimate the population ...

statistics - 2. Assume that the population proportion of adults having a college...