Mathematics

Mathematics, 28.10.2019 22:31, mrsroberts210

Random samples of 44 blended fuels are tested in a lab to ascertain the bio/total carbon ratio. if the true mean is .9590 with a standard deviation of 0.0080 within what interval will 98 percent of the sample means fall?

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Mathematics, 24.06.2019 18:00, jackkkkk32

I. the national assessment of educational progress tested a simple random sample of 1,000 thirteen year old students in both 2004 and 2008 (two separate simple random samples). the average and standard deviation in 2004 were 257 and 39, respectively. in 2008, the average and standard deviation were 260 and 38, respectively. calculate a 90% confidence interval for the change in average scores from 2004 to 2008, and interpret this interval in the context of the application. (reminder: check conditions.)31

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Mathematics, 19.09.2019 16:30, yonna74

Concerns about climate change and co2 reduction have initiated the commercial production of blends of biodiesel (e.g., from renewable sources) and petrodiesel (from fossil fuel). random samples of 35 blended fuels are tested in a lab to ascertain the bio/total carbon ratio. (a) if the true mean is 0.9480 with a standard deviation of 0.0060, within what interval will 95 percent of the sample means fall? (round your answers to 4 decimal places.)

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Business, 17.10.2019 23:30, Bradgarner772

Adesign engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. he knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. on three recent production batches, he tested service life on random samples of four headlamps, with the following results: what is the standard deviation of the sampling distribution of sample means for whenever service life is in control? sample service life (hours. 1 495 500 505 500 2 525 515 505 515 3 470 480 460 470 select one: a. 10 hours b. 6.67 hours c. 11.55 hours d. 5 hours e. 20 hours

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Business, 18.10.2019 00:30, SmokeyRN

Adesign engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. he knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. on three recent production batches, he tested service life on random samples of four headlamps, with these results: what is the standard deviation of the sampling distribution of sample means for whenever service life is in control? select one: a. 10 hours b. 6.67 hours c. 11.55 hours d. 5 hours e. 20 hours

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