Question 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