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 32 blended fuels are tested in a lab to ascertain the bio/total carbon ratio.

(a) If the true mean is .9130 with a standard deviation of 0.0040, within what interval will 98 percent of the sample means fall? (Round your answers to 4 decimal places.)

The interval is from 0.0016450.001645 Incorrect

to 0.0016450.001645 Incorrect

(b) If the true mean is .9130 with a standard deviation of 0.0040, what is the sampling distribution of X

X ?

1. Exactly normal with = .9130 and = 0.0040.
2. Approximately normal with = .9130 and = 0.0040.
3. Exactly normal with = .9130 and
4. x
6. =0.0040/32
10. .
11. x=0.0040/32.
12. Approximately normal with = .9130 and
13. x
15. =0.0040/32
19. .