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3 years ago

4+9=−2−3 What is the solution to the equation above?

Mathematics

1 answer:

mr_godi [17]3 years ago

3 0

Answer:

13= -1

Step-by-step explanation:

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Examine this system of equations. What integer should the second equation be multiplied by so that when the two equations are ad

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Answer:

Step-by-step explanation:

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3 years ago

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Answer:

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Answer:

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3 years ago

One hundred teachers attended a seminar on mathematical problem solving. The attitudes of representative sample of 12 of the tea

zzz [600]

Answer:

a) 1.9

b) 3.25

c) 1.5

d) -5.25

Step-by-step explanation:

We are given the following in the data:

4, 7, -1, 1, 0, 5, -3, 2, -1, 6, 5, -2

a) Mean change score

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{23}{12} = 1.9$

b) standard deviation for this population

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

Sum of differences = 126.92

$S.D = \sqrt{\dfrac{126.92}{12}} = 3.25$

c) median change score

Sorted data: -3, -2, -1, -1, 0, 1, 2, 4, 5, 5, 6, 7

$Median:\\\text{If n is odd, then}\\\\Median = \displaystyle\frac{n+1}{2}th ~term \\\\\text{If n is even, then}\\\\Median = \displaystyle\frac{\frac{n}{2}th~term + (\frac{n}{2}+1)th~term}{2}$

$\text{Median} = \dfrac{6^{th}+7^{th}}{2} = \dfrac{1+2}{2} = 1.5$

d) change score that is 2.2 standard deviations below the mean.

$\mu - 2.2(\sigma)\\1.92 - 2.2(3.25) = -5.25$

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3 years ago

Which answers arr showing a Reflection?

masya89 [10]

D is the answer showing a reflection

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3 years ago

Read 2 more answers