Answer:
a) 1.9
b) 3.25
c) 1.5
d) -5.25
Step-by-step explanation:
We are given the following in the data:
4, 7, -1, 1, 0, 5, -3, 2, -1, 6, 5, -2
a) Mean change score
b) standard deviation for this population
where are data points,
is the mean and n is the number of observations.
Sum of differences = 126.92
c) median change score
Sorted data: -3, -2, -1, -1, 0, 1, 2, 4, 5, 5, 6, 7
d) change score that is 2.2 standard deviations below the mean.
Answer:
This situation represents [a.) exponential decay
The rate of growth or decay, r, is equal to c.) 0.2
So the value of the computer each year is g.) 80% of the value in the previous year.
It will take [i.) 3 years for the value of the computer to reach $512.
Step-by-step explanation:
Since the value depreciates each year, it represents exponential decay.
The rate of growth or decay, r, is equal to
Depreciates 20%, so r = 0.2.
So the value of the computer each year is ... of the value in the previous year,
Depreciates 20%, so it is 100% - 20% = 80% of the value in the previous year.
It will take x years for the value of the computer to reach $512.
The value of the computer after x years is given by:
In which V(0) is the initial value and r is the decay rate. So
We want to find x for which V(x) = 512. So
Applying log to both sides:
So it will take 3 years.