Mapter 9 Jessica Salmeron-Uribe
:)
Due in 3 hours, 46 minutes. Due Tue 08/11/2020 11:59 pm
A school administrator wants to see if there is a difference in the number of students per class for Portland Public School
district (group 1) compared to the Beaverton School district (group 2). Assume the populations are normally distributed
with unequal variances. A random sample of 25 Portland classes found a mean of 38 students per class with a standard
deviation of 2. A random sample of 27 Beaverton classes found a mean of 35 students per class with a standard
deviation of 4.
1)
1)
Find a 99% confidence interval in the difference of the means. Use technology to find the critical value using df -
38.866 and round answers to 4 decimal places.
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Points possible: 1
This is attempt 1 of 3.
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i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

37

step-by-step explanation:

78.59 is the mean

step-by-step explanation:

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.