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3 years ago

What is the relationship between variance and standard deviation?

1 answer:

8 0

The relationship between variance and standard deviation is :
Standard deviation = sqrt (variance),
Variance = standard deviation^2.

hope this help

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A farmer finds that if she plants 60 trees per acre, each tree will yield 45 bushels of fruit. she estimates that for each addit

Mkey [24]

Answer: 60 trees

Explanation:
Even if there are trees planted per acre, the decrease of yield of each tree is significant enough to make it less worthwhile to have more trees than less.

In other words, when she plants 60 trees per acre, she gets 2700 bushels of fruit per acre, because 45 bushels per tree = 45 • 60 = 2700. If you plant another tree, you get the equation 41 • 61 = 2501 because there are 4 less bushels per tree. 2501 < 2700 so 60 per acre would maximize the harvest.

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3 years ago

Which is a completw sentence?

cestrela7 [59]

D. would be the right answer mate

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3 years ago

True or false if ab intersects cd in point e then ∠AED and ∠BED form a linear pair of angles

DIA [1.3K]

That is true! if they intersect at e angles AED and BED share a side and an angle which makes them a linear pair!

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3 years ago

In a survey of 100 adults, 91 of them said that they trusted DNA testing. a. What is pˆ , the sample proportion of adults who tr

Phantasy [73]

Answer:

a) The sample proportion of adults who trust DNA testing is p=0.91.

b) 98% CI: $0.84\leq \pi \leq0.98$

We can claim with 98% confidence that the real proportion of adults that trust DNA is between 0.84 and 0.98.

Step-by-step explanation:

a) In this problem, we calculate p-hat, the sample proportion of adults who trust DNA testing, as

$\hat{p}=\frac{x}{N} =\frac{91}{100}=0.91$

b) The z-value for a 98% CI is z=2.326.

The standard deviation of the proportion is:

$\sigma=\sqrt{\frac{p(1-p)}{n} }=\sqrt{\frac{0.91(1-0.91)}{100} } = 0.029$

Then we can define the CI as:

$\hat p-z*\sigma\leq \pi \leq \hat p+z*\sigma\\\\0.91-2.326*0.0.29\leq \pi \leq 0.91+2.326*0.0.29\\\\0.91-0.07\leq \pi \leq0.91+0.07\\\\0.84\leq \pi \leq0.98$

We can claim with 98% confidence that the real proportion of adults that trust DNA testing is between 0.84 and 0.98.

4 0

4 years ago

There is a equilateral triangle with sides of 13 inches, how do I find the area of that triangle?

Anuta_ua [19.1K]

Answer:

73.18

Step-by-step explanation:

equilateral triangle means all sides are the same

A=(√3/4)a^2

A=(√3/4)*13^2

A=73.18 inches square

8 0

4 years ago

Read 2 more answers