# Question posted by RonnettaSims34

## RonnettaSims34 from

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## Questions Posted by RonnettaSims34

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Bounty Status Category Sub-Category Question Due
\$1.00 Closed, closed Mathematics Statistics condidence interval
out of a sample of 459 randomly selected light bulbs tested in a laboratory, 291 lasted more than 500 hours. Find the 90% confidence interval for the true population proportion of light bulbs that...
Aug. 09, 2009
\$1.00 Closed, closed Mathematics Statistics sampling
Why would it be important to a business to determine the sample size needed before collecting information?
Aug. 06, 2009
\$1.00 Closed, closed Mathematics Probability Probablility
The weekly salaries of teachers in one state are normally distributed with a mean of \$490 and a standard deviation of \$45. a. What is the probability that a randomly selected teacher earns more than \$...
Aug. 02, 2009
\$1.00 Closed, closed Mathematics Probability probability
Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years (based on data from 'Getting Things Fixed,' Consumer Reports). a. Find the...
Jul. 31, 2009
\$1.00 Closed, closed Mathematics Probability For drivers in the 20-24 age bracket
For drivers in the 20-24 age bracket, there is a 34% rate of car accidents in one year (based on data from the National Safety Council.) An insurance investigator finds that in a group of 500...
Jul. 30, 2009