In a random sample of 80 students in first grade the main hours of sleep per night was 9.4 with a standard deviation of 0.41 in a random sample of 50 students in 12th grade the main hour of sleep per night was 7.5 with a standard deviation of 0.52. which interval is a 99% code finance interval for the difference between the main hours of sleep.
(1.75 h, 2.05 h)
(1.89 h, 1.91h)
(1.43 h, 2.37h)
(1.68 h, 2.12 h)

the perimeter is increased by a factor of 2

sss (side, side, side)

sas (side, angle, side)

asa (angle, side, angle)

aas (angle, angle, side)

hl (hypotenuse, leg)

the answer is d

the answer is in the first quadrant, which make the y-int positive.

since the dots are going down, therefore the correlation is negative

i hope it is right.

the correct answer is b. negative exponential growth.

step-by-step explanation:

you can tell it's an exponential function because it decreases rapidly then levels out and never touches the x-axis.

it is negative because the y-axis decreases as the x-axis increases.

therefore it is a negative exponential growth graph.

hope i !