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2 years ago

Use compatible numbers to find two estimates

2 answers:

7 0

Use compatible numbers to find two estimates that the quotient is between. For example:

1,624 divided by 3
 1500 / 3 = 500 

1800 / 3 = 600

Andreas93 [3]2 years ago

5 0

2000 / 500 = 4

4000 / 800 = 5

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If you want to be 95% confident of estimating the population mean to within a sampling error of plus or minus3 and the standard

Aleksandr [31]

Answer:

The sample size required is at least 171

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is required?

A samle size of at least n is required, in which n is found when $M = 3, \sigma = 20$

$M = z*\frac{\sigma}{\sqrt{n}}$

$3 = 1.96*\frac{20}{\sqrt{n}}$

$3\sqrt{n} = 20*1.96$

$\sqrt{n} = \frac{20*1.96}{3}$

$(\sqrt{n})^{2} = (\frac{20*1.96}{3})^{2}$

$n = 170.7$

Rouding up

The sample size required is at least 171

5 0

2 years ago

A large college wishes to determine the average SAT scores for students who apply from New York. They surveyed 105 students from

sweet [91]

Answer:

Statements I and II

Step-by-step explanation:

In Statistics, parameter is any numerical value that characterizes a population while statistics are numerical values that characterizes a sample from a given population.

Statistics are most often used to estimate the population parameters

For example the sample mean is a statistic and the population mean is a paranmeter

The mean SAT score of all students from New York is the parameter.

The mean SAT score of 105 students from New York is called the statistic.

The correct choice is the third option.

5 0

3 years ago

What is the midpoint of the segment show below?

USPshnik [31]

Answer:

The answer would be c) (5,1/2)!

Hope this helps!

Brainliest?

7 0

3 years ago

Solve inequality: -6x < 36

7nadin3 [17]

Answer:

x>−6

Step-by-step explanation:

-6x<36

Multiply both sides by -1. ( reverse the inequality )

(-6x) (-1) > 36 (-1)

Simplify

6x > -36

Divide both sides by 6

6x divided by 6 -36 divided by 6

Simplify

x> -6

Hope this helped

6 0

2 years ago

Which are the correct classifications for the polygon?

Yakvenalex [24]

I believe the correct answer from the choices listed above is option A. THe correct classification of the polygon in the figure would be a concave hexagon. Counting the number of sides, we have 6 sides making it a hexagon. It is concave since one side is hollowed inward.

4 0

2 years ago