Mathematics

Mathematics, 29.06.2019 03:20, smariedegray

To estimate μ, the mean salary of full professors at american colleges and universities, you obtain the salaries of a random sample of 81 full professors. the sample mean is = $77,220 and the sample standard deviation is s = $4500. a 98% confidence interval for μ is

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Mathematics, 24.06.2019 13:00, jaidaarmstrong

To estimate m, the mean salary of full professors at american colleges and universities, you obtain the salaries of a random sample of 400 full professors. the sample mean is x = $73,220 and the sample standard deviation is s = $4400. a 99% confidence interval for m is a) 73220 â± 11440. b) 73220 â± 572. c) 73220 â± 431. d) 73220 â± 28.6.

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Mathematics, 12.08.2019 19:20, love0000

In order to obtain a sample of undergraduate students in the world, a simple random sample of 10 countries is selected. from each of the selected countries, 10 colleges or universities are chosen at random. finally, from each of these 100 colleges or universities, a simple random sample of 20 undergraduate students is selected. thus, the final sample consists of 2,000 undergraduates. this is an example of:

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Mathematics, 17.10.2019 19:00, KennyOaks6230

Suppose the mean salary for full professors in the united states is believed to be $61,650. a sample of 36 full professors revealed a mean salary of $69,800. assuming the standard deviation is $5,000, can it be concluded that the average salary has changed or is it still the same. (using a 0.05 level of significance)? (this mean you should perform a hypothesis testing h^0: μ_y^0=$61.650) ( provide 2 approached both the "t-test" and "p-value" approach. ) create the 95 % confidence interval for the population mean using the information above?

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Mathematics, 19.10.2019 05:10, jsph32

Salaries differ greatly between faculty members at public universities in the united states. full professors (who have tenure and do research) earn an average of $125,572 per year with a standard deviation of $18,328. associate professors (who are working towards tenure and do research) earn an average of $90,101 per year with a standard deviation of $12,741. lecturers (whose primary responsibility is teaching and do not earn tenure) earn an average of $59,707 per year with a standard deviation of $7,386. assume all three populations are normally distributed. a. what is the probability that a randomly selected full professor makes less than $100,000 per year?

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