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A dishwasher has a mean life of 10 years with an estimated standard deviation of 1.25 years. Assume the life of a dishwasher is normally distributed.
A.) Find the probability that a dishwasher will last between 8 and 10 years.
B.) A manufacturer of dishwashers only wants to replace free of charge 5% of all dishwashers. How long should the manufacturer make the warranty period?
Sam Hill, Director of Media Research in Christchurch,
If the difference between two means is not statistically significant, how certain are you that the independent variable really does not affect the dependent variable?
assume that adults have iq scores that are normally distributed with a mean of u105 and a standard deviation o15. find
What is the standard general score conversion formula? Is this the same as a z-score formula? Which leads me to ask How do you convert from one standard score to another?
Consider an urn containing 12 balls, of which 8 are white. Let a sample of size 4 be drawn with replacement (without replacement).
What is the probability that exactly 25 households have broadband coverage? b. What is the probability that at most 30 households have broadband coverage
Estimate the mean study time for the population of all students. What is the probability that the sample mean exceeds the population mean by more than 2 hours?
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
small sample mean problem. the maker of mini-oats cereal uses an automated packaging machine to pack its 24 ounce box
A researcher collected sample data for 17 women ages 18 to 24 . The sample had a mean serum cholesterol level (measured in mg/100 mL) of 188.8 , with a standard deviation of 5.5.
What do you think will happen? Consider using the Simple Random Sample applet to select a sample of size 5 from a population of size 10.
Suppose the family includes one set of twins, and all arrangements are equally likely. What is the probability that the twins will be in the middle two places (positions 5 and 6)?
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