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What is the standard error of x

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1. Concerns about climate change and CO2 reduction have initiated the commercial production of blends of biodiesel (e.g., from renewable sources) and petro diesel (from fossil fuel). Random samples of 33 blended fuels are tested in a lab to ascertain from bio/total carbon ratio.

If the true mean is .9510 with a standard deviation of 0.9510 with a standard deviation of 0.0030, within what interval will 99 percent of the sample means fall? (Round your answers to 4 decimal places.)

The interval is from ___ to __
2. A) Find the standard error of the mean for each sampling situation. (Assuming a normal population). (Round your answers to 2 decimal places.)

Standard Error

σ = 42, n = 9

σ = 42, n = 36

σ = 42, n =144
3. The highway fuel economy of a 2016 Lexus RX 350 FWD 6-cyclinder 3.5L automatic 5 speed using premium fuel is a normally distributed random variable with a mean of µ = 25.50 mpg and a standard deviation of σ = 2.25 mpg.

What is the standard error of X, the mean from a random sample of 25 fill ups by one driver? (Round your answers to 4 decimals places.)

Standard error of X:

Within what interval would you expect the sample mean to fall, with 98 percent probability? (Round your answers to 4 decimal places.)

The Interval is from ___ to ___

Reference no: EM132850640

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