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A sample of 10 electronic tubes produced by a company showed a mean lifetime of 1200 hours and a standard deviation of 100 hours. estimate the mean and the standard deviation of the population of all such tubes produced by the company?
They plan to set up a radar trap and check the speeds of 80 randomly selected cars. Can this distribution be approximated by a normal curve?
Prepare an analysis of how you developed your instrument. Be sure to describe how you chose your items, how you would norm this instrument.
Formulate an 84% interval estimate for the true proportion of employees within one year of retirement in the entire corporation.
If a random sample of 81 students had a sample mean score of 74.6, find a 90 percent confidence interval estimate for the average score of all students.
Select the suitable hypothesis.H 0 : π ≥ .052; H 1 : π 0 if z
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
How many books should be tested to estimate with 95% to within 0.1 lb, the average force required to break the binding? Assume that sd is known to be 0.8 lb.
The information that the distribution of the serve speeds was bell shaped. What proportion of the player's serves are expected to be between 107 mph and 118 mph?
Develop a 95% confidence interval of the difference between the daily population means for the two airports.
Finds that 3 contain errors. If the accountant's theory is correct, what is the probability that at least 3 invoices contain errors in a random sample of 10?
In doing so, you collect a random sample of 50 salespersons employed by his company, which is thought to be representative of sales staffs of competing organizations in the industry. The collected random sample of size 50 showed that only 18 were ..
Set up the null and alternative hypotheses for testing these claims. In order to conduct the test, the customer selected a significance level of alpha=.05. Interpret this value. (I.e. what does it mean to conduct the test at a level of alpha=.05)
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