The amount of carbon dioxide (\text{CO}_2)(CO 2

)left parenthesis, start text, C, O, end text, start subscript, 2, end subscript, right parenthesis in the atmosphere increases rapidly as we continue to rely on fossil fuels.
The relationship between the elapsed time, ttt, in decades, since \text{CO}_2CO
2

start text, C, O, end text, start subscript, 2, end subscript levels were first measured, and the total amount of \text{CO}_2CO
2

start text, C, O, end text, start subscript, 2, end subscript in the atmosphere, A_{\text{decade}}(t)A
decade

(t)A, start subscript, start text, d, e, c, a, d, e, end text, end subscript, left parenthesis, t, right parenthesis, in parts per million, is modeled by the following function:
Adecade(t)=315⋅(1.06)t
Complete the following sentence about the yearly rate of change in the amount of \text{CO}_2CO
2

start text, C, O, end text, start subscript, 2, end subscript in the atmosphere.
Round your answer to four decimal places.
Every year, the amount of \text{CO}_2CO
2

start text, C, O, end text, start subscript, 2, end subscript in the atmosphere increases by a factor of
.

Assume the population consists of the values 1, 3, 14. assume samples of 2 values are randomly selected with replacement (see page 23 for a definition) from this population. all the samples of n=2 with replacement are 1 and 1, 1 and 3, 1 and 14, 3 and 1, 3 and 3, 3 and 14, 14 and 1, 14 and 3, and 14 and 14. for part a) of this project, find the variance σ2 of the population {1, 3, 14}. for part b) of this project, list the 9 different possible samples of 2 values selected with replacement, then find sample variance s2 (which includes division by n-1) for each of them, and finally find the mean of the sample variances s2. for part c), for each of the 9 different samples of 2 values selected with replacement, find the variance by treating each sample as if it is a population (using the formula for population variance, which includes division by n), then find the mean of those population variances. for part d), which approach results in values that are better estimates of σ2 from part a): part b) or part c)? why? when computing variances of samples, should you use division by n or n-1? upload your answers for a), b), c), and d). the preceding parts show that s2 is an unbiased estimator of σ2. is s and unbiased estimator of σ? the above problem is from triola’s essentials of statistics, 4th edition.