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Gala2k [10]
3 years ago
6

What is -3 to the -2nd power

Mathematics
2 answers:
Zinaida [17]3 years ago
6 0
The answer is 9. Two negitives make a positive.
cluponka [151]3 years ago
4 0
3 to the 2 power is6
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The mean height of married American women in their early twenties is 64.5 inches and the standard deviation is 2.5 inches. The m
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Answer:

The equation for regression line and predicting a husband's height for married couples in their early 20s

Equation: Y'=33.67+0.54*X'

Step-by-step explanation:

r=0.5

x'=64.5

Sx=2.5

y'=68.5

Sy=2.7

General regression line equation is:

Y'=a+b*X'

so the slope of the regression line is the linear correlation coefficient multiplied by the standard deviation for y' divided by the standard deviation for x'

b=r*\frac{S_{y}}{S_{x}}\\b=0.5*\frac{2.7}{2.5}\\b=0.54

The intercept with axis y is the mean of the decreased by the product of the slope and the mean of x

a=y'-b*x'\\a=68.5-0.54*64.5\\a=33.67

The equation regression line then is:

Y'=33.67+0.54*X'

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