Question posted by RonnettaSims34
Questions Posted by RonnettaSims34
1 - 5 of 5
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||
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||
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||
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|