Friday

November 28, 2014

November 28, 2014

Posted by **Rachel** on Saturday, February 28, 2009 at 2:36pm.

a)225

b)325

c)425

d)525

e)625

- statistics -
**MathGuru**, Sunday, March 1, 2009 at 10:53amFormula:

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

...where n is the sample size you seek, z-value is obtained using a z-table for the confidence interval (90%) in the problem, p and q represent proportions, E is the maximum error, and ^2 means squared.

Substituting values:

n = [(1.645) * .5 * .5]/.04^2

...where 1.645 represents the 90% confidence interval, .5 represents p if no value is stated, q = 1 - p = 1 -.5 = .5, .04 is 4% in decimal form and represents the maximum error of estimate for a proportion.

Calculate and choose the closest answer. There may be differences in the answer due to methods used.

I hope this will help.

**Answer this Question**

**Related Questions**

statistics - A pollster conducts a survey of a random sample of voters in a ...

HCA 240 - I need help with this assignment about HIV/AIDS: An Overview its due ...

Statistics - In a survey, 55% of the voters support a particular referendum. If ...

hiv/aids management) - discussthe history of hiv/aids,and development and the ...

Story-Making - For Health, we have to do a report on AIDS/HIV, we can do ...

population,poverty and human development(hiv/aids - "the larger a population,...

STATISTICS - In a survey of 1000 registered U.S. voters, 55% respond that they ...

science - How many DALYs are lost by a person who has a life expectancy of 74, ...

Health (Ms. Sue) - Discuss at least four things you can do to contribute to HIV ...

statistics - A survey was conducted to determine the proportion of male and ...