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A simple random sample of 225 workers in a large factory had weekly salaries with a sample mean of $600 and a population standard deviation of $30. (a) Calculate a 99% confidence interval for the mean weekly salary of all workers in the factory. (b) How many more workers should be sampled if it is required that the estimate must be within L3 of the true average (again, with 99% confidence)? Hint: This means a tolerance of L3 - equivalent to a confidence interval width of $6.
The first sentence of the information from the Gallup Organization states, "72% of Americans support lowering the drunk driving limit to 0.08% BAC."
a group of investors wants to develop a chain of fast-food restaurants. in determining potential costs for each
How would you determine the expected value of the number of girls who will be selected?
The fraternities and sororities at St. Algebra College have been plagued by declining membership over the past several years and want to know
you wish to test if there is a difference in the average time male and female students spend studying for a business
Regarding the testing of pharmaceutical companies' claims that their drugs are safe, a U.S. Food and Drug Administration official has said that it's "better to turn down 1000 good drugs than to approve one that's unsafe."- If the null hypothesis i..
(b) Use Chebyshev's inequality to find the confi- dence level α such that M90(X), the estimate based on 90 observations, is within 0.05 of PX (1). In other words, find α such that
Determine the probability that everyone who appears for the departure of this flight will have a seat.
Convert the following proportions to percentages, preserving the accuracy in the proportion:
Does the data prove a significant difference in mean GPAs? GPA1 GPA for Randomly Selected Students in Four Business Majors.
Produce a regression equation to predict the PP100 for vehicles in the model y1 = ß0 + ß1x1 + ß2x2 + e.
To estimate the percentage of households in Connecticut which use fuel oil as a heating source, a researcher collects information
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