(3x3 + 11x2 + 4x + 1)/ (x2 + x)

1 answer:

6 0

If those are exponents, then...

3x^3 + 11x^2 + 4x + 1
----------------------------- Cancel out the 11x^2 with the x^2
x^2 + x

3x^3 + 10x^2 + 4x +1
----------------------------- Cancel out the x with the 4x
x

3x^3 + 10x^2 + 3x +1

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Farmers know that driving heavy equipment on wet soil compresses the soil and injures future crops. Here are data on the "penetr

Greeley [361]

Answer:

Step-by-step explanation:

Hello!

To see if driving heavy equipment on wet soil compresses it causing harm to future crops, the penetrability of two types of soil were measured:

Sample 1: Compressed soil

X₁: penetrability of a plot with compressed soil.

n₁= 20 plots

X[bar]₁= 2.90

S₁= 0.14

Sample 2: Intermediate soil

X₂: penetrability of a plot with intermediate soil.

n₂= 20 (with outlier) n₂= 19 plots (without outlier)

X[bar]₂= 3.34 (with outlier) X[bar]₂= 2.29 (without outlier)

S₂= 0.32 (with outlier) S₂= 0.24 (without outlier)

Outlier: 4.26

Assuming all conditions are met and ignoring the outlier in the second sample, you have to construct a 99% CI for the difference between the average penetration in the compressed soil and the intermediate soil. To do so, you have to use a t-statistic for two independent samples:

Parámeter of interest: μ₁-μ₂

Interval:

[(X[bar]₁-X[bar]₂)± $t_{n_1+n_2-2;1-\alpha/2}$ *Sa $\sqrt{\frac{1}{n_1} +\frac{1}{n_2} }$ ]