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A survey organization takes a simple random sample of  200 households from a city of 50,000 households....

A survey organization takes a simple random sample of  200 households from a city of 50,000 households. On the average there are  2.3 persons per sample household, and the SD is 1.8.

a)  Find a 90%-confidence interval for the average household size in  the city

b)  Find a 80%-confidence interval for the average household size in the city.

c)  If the researcher decreased the sample size to only 50 people, the length of the  80% confidence interval would be:

(i) multiplied by 2        (ii)multiplied by 4         (iii) divided by 2         (iv) divided by 4

Math   Statistics-And-Probability   
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