3 years ago

I need help with this question!

Mathematics

1 answer:

ki77a [65]3 years ago

4 0

Answer:

Step-by-step explanation:

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A realtor collects the data set given in DS 12.2.4 concerning the sizes of a random selection of newly constructed houses in a c

Yuliya22 [10]

The table is missing in the question. The table is attached below.

Solution :

Let X = appraised value

Y = area (square feet)

The regression line is given by :

$\hat y = b_0+b_1X$

$b_1=\frac{n\sum XY-\sum X \sum Y}{n \sum X^2-(\sum X)^2}$

$=\frac{15(5964990)-(2157)(33370)}{15(404799)-(2157)^2}$

$=12.3267$

$b_0=\frac{\sum Y}{n}-b_1\frac{\sum X}{n}$

$=\frac{33370}{15}-\left(12.3267 \times \frac{2157}{15}\right)$

$b_0=452.0841$

The regression line is :

$\hat Y = 452.0841+12.3267 X$

To estimate the error variance, we have:

Error variance, $\sigma =\sqrt{\frac{\sum (Y-\hat Y)^2}n-2{}}$

$=\sqrt{\frac{587682.3}{15-2}}$

$=212.6178$

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3 years ago

In a candy bar, 165 calories are from sugar. There are 250 calories in the candy bar. What percent of the calories are from suga

stiv31 [10]

165/200=33/40
33/40=0.825
0.825=82.50%
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What pattern of 7, 15,27

GarryVolchara [31]

Ok well what I did but I’m not sure if it answers your question but I did 27-15=12-7=5 and that what I got maybe it’s 5 it’s just an assumption

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A pair of shoes weighs 650 grams.How many decigrams does it weigh?

Scorpion4ik [409]

We know that 1 gram = 10 decigrams

That means that 650 * 10= 6500

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Nine times the difference of a number and five is the same as 5 increased by nine times the number plus five times the number .

horsena [70]

9(x-5)=5+(9x+5x)
9x-45=5+14x
9x-14x=45+5
-5x=50
X=50/-5
X=-10

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3 years ago