Answer:
only -7
Step-by-step explanation:
Just plug them in.
so for x=-7
So this one is extraneous
Then if you plug -3 in you get 1 = 1 so this one is not extraneous. if you need me to work this one out let me know.
Answer:
![d = \frac{78.24 -66.25}{\sqrt{\frac{7^2 +7^2}{2}}}= 1.713](https://tex.z-dn.net/?f=%20d%20%3D%20%5Cfrac%7B78.24%20-66.25%7D%7B%5Csqrt%7B%5Cfrac%7B7%5E2%20%2B7%5E2%7D%7B2%7D%7D%7D%3D%201.713)
For the interpretation we consider a value for d small is is between 0-0.2, medium if is between 0.2-0.8 and large if is higher than 0.8.
And on this case 1.713>0.8 so we have a large effect size
This value of d=1.713 are telling to us that the two groups differ by 1.713 standard deviation and we will have a significant difference between the two means.
Step-by-step explanation:
Previous concepts
The Effect size is a "quantitative measure of the magnitude of the experimenter effect. "
The Cohen's d effect size is given by the following formula:
![d = \frac{\bar X_1 -\bar X_2}{\sqrt{\frac{s^2_1 +s^2_2}{2}}}](https://tex.z-dn.net/?f=%20d%20%3D%20%5Cfrac%7B%5Cbar%20X_1%20-%5Cbar%20X_2%7D%7B%5Csqrt%7B%5Cfrac%7Bs%5E2_1%20%2Bs%5E2_2%7D%7B2%7D%7D%7D)
Solution to the problem
And for this case we can assume:
the mean for females
the mean for males
represent the deviations for both groups
And if we replace we got:
![d = \frac{78.24 -66.25}{\sqrt{\frac{7^2 +7^2}{2}}}= 1.713](https://tex.z-dn.net/?f=%20d%20%3D%20%5Cfrac%7B78.24%20-66.25%7D%7B%5Csqrt%7B%5Cfrac%7B7%5E2%20%2B7%5E2%7D%7B2%7D%7D%7D%3D%201.713)
For the interpretation we consider a value for d small is is between 0-0.2, medium if is between 0.2-0.8 and large if is higher than 0.8.
And on this case 1.713>0.8 so we have a large effect size
This value of d=1.713 are telling to us that the two groups differ by 1.713 standard deviation and we will have a significant difference between the two means.
Answer:
Step-by-step explanation:
x + 2y = 8 -----------(I)
x - 2y = -4 -----------(II)
Add equation (I) & (II) and thus y will be eliminated and we can get the value of 'x'
(I) x + 2y = 8
(II) <u>x - 2y = -4</u><u> </u>{Now add}
2x = 4
x = 4/2
x = 2
Substitute x = 2 in equation (I)
2 + 2y = 8
2y = 8 - 2
2y = 6
y = 6/2
y = 3
Answer:13( n + 5) = 91
Step-by-step explanation: solve the parenthesis first and then multiply that by 13