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Question: Most lightbulb manufacturing companies claim that their 60-watt bulbs have an average life of 1000 hours. A skeptic with some skill as an electrician wired up sockets and timers and lighted 40 bulbs. The life of each bulb recorded automatically. Is the companies' claim justified?
Use a calculator or appropriate computer software to verify that, for the preceding data, xbar = 5.1.
according to a survey 90 of senior executives at major u.s corporations felt that the federal budget will not be
The athletic director claims that the atendance is the same as last year. What is the test value needed to evaluate the claim?
of all mortage foreclosures in the united states 69 are caused by diability . people who are injured or ill cannot work
use this information about the overhead reach distances of adult females mean 205.5 cm sd 8.6 cm and over head reach
Construct a 98% confidence interval for the population mean and interpret the result (round margin of error E to the nearest dollar).
For a one-tailed hypothesis test where you reject H0 only in the lower tail, the critical value is -2.5280. What is the statistical decision if tSTAT = -1.19?
let q be a random variable which is uniformly distributed between 0 and 1. on any given day a particular machine is
mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. the average tread
Compared to the situation in which the population is either extremely large or infinite in size, what effect does the use of the finite population term tend to have on the resulting value of the standard error?
How many of the employees would you expect to have voted for a Democrat as a Representative?
What is the required sample size for determining the proportion of defective items in a production process if the proportion is to be known to within 0.05 with 90% confidence? No guess as to the value of the population proportion is available.
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