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Andru [333]
2 years ago
7

Need help ASAP. what is the best estimate for the value of the expression?​

Mathematics
1 answer:
Yakvenalex [24]2 years ago
6 0

Answer:

11

Step-by-step explanation:

u do 4x5 which is 20

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Linda already owns 7 necklaces, and additional necklaces are priced at 3 for a dollar. Write an equation that shows the relation
maksim [4K]

Answer:

95+5x=13x

I'd if this is right im not smart

6 0
2 years ago
Read 2 more answers
Assume that the paired data came from a population that is normally distributed. using a 0.05 significance level and dequalsxmin
Artemon [7]
"<span>Assume that the paired data came from a population that is normally distributed. Using a 0.05 significance level and d = (x - y), find \bar{d}, s_{d}, the t-test statistic, and the critical values to test the claim that \mu_{d} = 0"

You did not attach the data, therefore I can give you the general explanation on how to find the values required and an example of a random paired data.

For the example, please refer to the attached picture.

A) Find </span><span>\bar{d}
You are asked to find the mean difference between the two variables, which is given by the formula:
\bar{d} =  \frac{\sum (x - y)}{n}

These are the steps to follow:
1) compute for each pair the difference d = (x - y)
2) sum all the differences
3) divide the sum by the number of pairs (n)

In our example: 
</span><span>\bar{d} =  \frac{6}{8} = 0.75</span>

B) Find <span>s_{d}
</span><span>You are asked to find the standard deviation, which is given by the formula:
</span>s_{d} =  \sqrt{ \frac{\sum(d - \bar{d}) }{n-1} }

These are the steps to follow:
1) Subtract the mean difference from each pair's difference 
2) square the differences found
3) sum the squares
4) divide by the degree of freedom DF = n - 1

In our example:
s_{d} = \sqrt{ \frac{101.5}{8-1} }
= √14.5
= 3.81

C) Find the t-test statistic.
You are asked to calculate the t-value for your statistics, which is given by the formula:
t =  \frac{(\bar{x} - \bar{y}) - \mu_{d} }{SE}

where SE = standard error is given by the formula:
SE =  \frac{ s_{d} }{ \sqrt{n} }

These are the steps to follow:
1) calculate the standard error (divide the standard deviation by the number of pairs)
2) calculate the mean value of x (sum all the values of x and then divide by the number of pairs)
3) calculate the mean value of y (sum all the values of y and then divide by the number of pairs)
4) subtract the mean y value from the mean x value
5) from this difference, subtract  \mu_{d}
6) divide by the standard error

In our example:
SE = 3.81 / √8
      = 1.346

The problem gives us <span>\mu_{d} = 0, therefore:
t = [(9.75 - 9) - 0] / 1.346</span>
  = 0.56

D) Find t_{\alpha / 2}
You are asked to find what is the t-value for a 0.05 significance level.

In order to do so, you need to look at a t-table distribution for DF = 7 and A = 0.05 (see second picture attached).

We find <span>t_{\alpha / 2} = 1.895</span>

Since our t-value is less than <span>t_{\alpha / 2}</span> we can reject our null hypothesis!!

7 0
3 years ago
Complete each expression showing all steps, and simplify the final answer to lowest terms (improper fractions do not need to be
olga2289 [7]

Answer:

a. -\frac{576}{365}

b. \frac{23}{16}

Step-by-step explanation:

The image below shows step-by-step using Order of Operations (PEMDAS) to solve both of them.

Hope this helps my friend! :)

6 0
2 years ago
What is the sum?<br> x2-9<br> X+3
VashaNatasha [74]
The sum is x2 - 9x + 3
4 0
3 years ago
A baby weighed 7.25 lbs at birth. At the end of 8
iris [78.8K]

Answer:

<em>The baby weighed 14.5 pounds at the end of 8 months</em>

Step-by-step explanation:

<u>Proportions</u>

We know a baby weighed 7.25 pounds at birth.

It's given at the end of 8 months, the baby weighed twice its birth weight.

This means the baby weighed 2*7.25 = 14.5 pounds at the end of 8 months.

The baby weighed 14.5 pounds at the end of 8 months

5 0
2 years ago
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