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When Richard Stallman founded the Free Software Foundation in 1985, he was able to tap into the energy of many programmers around the world who wanted to work on a free operating system. Later, in the early 1990s, Linux Torvalds was also able to fi nd programmers to help him, in this case, to develop the Linux kernel. Why are so many programmers willing to work a long time on a diffi cult project and then give away the fruits of their labor for free? Is this more common with young programmers than old programmers? If so, why?
1. acme corporation manufactures light bulbs. the ceo claims that an average acme light bulb lasts 300 days. a
At 0.05 significance level, is there a difference in the mean number of defects per shift? Assume that the populations are approximately normally distributed and the variances are equal.
A certain brand of Green Energy light bulbs was advertised as having an average illumination life-span of 2,500 hours. A random sample of 50 bulbs burned out with a mean life-span of 2,470 hours and a sample standard deviation of 140 hours.
conduct a test of hypothesis to determine whether the mean payroll of the teams was different from 80 million. .05 is
What total size sample would be necessary if we wanted to estimate the true proportion to within ±0.08 using 90% confidence?
a crazy and lazy professor has developed a new grading system to make his life easier. he gives 10 a grades 80 b grades
A large internet retailer, is studying the lead time (elapsed time between when an order is placed and when it is filled) for a sample of recent orders. The lead times are reported in days.
A student wanted to construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a standard deviation of 1.5 years. What is the best point esti..
it is estimated that 10 of the athletes competing in a large tournament are users of an illegal drug to enhance
An average computer mouse inspector can inspect 50 mice per hour. The 48 computer mice inspectors at a particular factory can only insppect 46 mice per hour with a standard deviation of 10.
A promotion campaign is being planned to encourage people to reduce heat in their houses at night. In order to measure the campaign's impact, we want to determine the proportion of people who reduce their heat at night.
organic food is believed to be healthier and safer and you are willing to pay a premium for it. but is it really true
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