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ozzi
3 years ago
11

Regarding inferences about the difference between two population means, the sampling design that uses a pooled sample variance i

n cases of equal population standard deviations is based on:_________
Physics
1 answer:
ANEK [815]3 years ago
8 0

Answer:

independent samples.

Explanation:

  • independent samples are randomly selected models so that its findings do not depend on the values ​​of other observations. Many statistical analyzes rely on the assumption that the models are independent. Others are designed to estimate models that are not independent.
  • There are so many independent models that its choices can be randomly selected without relying on the evidence of other observations.

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I can fly but have no wings. I can cry but I have no eyes. Wherever I go, darkness follows me. What am I?
nlexa [21]

cloud?? thats prob wrong lol

7 0
3 years ago
Read 2 more answers
soaring birds and glider pilots can remain aloft for hours without expending power. Discuss why this is so.
vekshin1

Answer:

Since their wings and body develop the drag. When there is warm air then they expand their wings. Since,soaring birds and glider pilots have no engine, they always maintain their high speed to lift their weight in air for hours without expending power by convection

Explanation:

5 0
3 years ago
A straight, vertical wire carries a current of 2.15 A downward in a region between the poles of a large superconducting electrom
enot [183]

Answer:

a) F = 0.01234N to the south direction

b) F = 0.01234N to the north direction

c) F = 0.01234N

d) North of West

Explanation:

The magnetic force in a magnetic field is given by:

F = BIlsin \theta

Length of the wire, l = 1 cm = 0.01 m

Current flowing through the wire, I = 2.15 A

a) If the magnetic field direction is east

∅ = 90

F = 0.574 * 2.15 * 0.01

F = 0.01234 N to the south direction according to the Fleming's Right Hand Rule

b) If the magnetic field direction is south

The magnitude of the magnetic force remains the same

That is , F = BIL sin 90

F = 0.01234 N to the west

c) If the magnetic field direction is 30 degrees south

The angle between the magnetic field and the length of the wire still remains 90 degrees

Therefore the magnitude of the force still remains 0.01234

F = 0.01234 N

d) the direction of the force is the North of West

8 0
3 years ago
A train travels 99 kilometers in 2 hours, and then 90 kilometers in 3 hours. What is its average speed?
Agata [3.3K]

Average speed =

(total distance)/(total time)

Average speed = (99+90)/(2+3)

That's (189 km) / (5 hr)

Average speed = 37.8 km/hr

3 0
3 years ago
A 20 kilogram ball rolls down a 10 meter ramp at the rate of 15 meters per second. The kinetic energy is joules
kobusy [5.1K]

Answer:2250J

Explanation:

mass(m)=20kg

velocity(v)=15m/s

Kinetic energy=(m x v^2)/2

Kinetic energy =(20 x 15^2)/2

Kinetic energy =(20x15x15)/2

Kinetic energy=4500/2

Kinetic energy=2250J

3 0
3 years ago
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