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Svetradugi [14.3K]
2 years ago
8

Enter expression, e.g. (x^2-y^2)/(x-y)

Mathematics
1 answer:
Drupady [299]2 years ago
5 0
The answer i got was x+y
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For the multiple regression model Y with hat on top equals 40 plus 15 X subscript 1 minus 10 X subscript 2 plus 5 X subscript 3,
kvasek [131]

Answer:

When x1 and x2 decrease 4 units, y decreases by 20 units

Step-by-step explanation:

The regression model is

y=40+15x_1-10x_2+5x_3

We have to calculate y for a decrease of 4 units in x1 and x2. For this we have to calculate the variation of y in function of x1 and x2.

As it is a linear regression model, we have:

\Delta y=15\Delta x_1-10\Delta x_2

For a variation in 4 units of x1 and x2, we have

\Delta y=15\Delta x_1-10\Delta x_2\\\\\Delta y=15(-4)-10(-4)=-60+40=-20

6 0
3 years ago
In a certain county in​ 2013, it was thought that​ 50% of men 50 years old or older had never been screened for prostate cancer.
joja [24]

Answer:

120,0.60,100

Step-by-step explanation:

Given that in a certain county in​ 2013, it was thought that​ 50% of men 50 years old or older had never been screened for prostate cancer.

Suppose a random sample of 200 of these men shows that 120 of them had never been screened.

a) the observed frequency = 120

b) The observed proportion of men who said they had not been​ screened

=\frac{120}{200} \\=0.60

c) Expected number in the sample to say they had never been screened if​ 50% is the correct​ rate

= np

= 200*0.50=100

8 0
3 years ago
Does anybody know this answer????
Ira Lisetskai [31]

Answer:

959.42 x 10³

Step-by-step explanation:

9.62 x 10⁵ - 2.58 x 10³

= 962 x 10³ - 2.58 x 10³

= 959.42 x 10³

4 0
2 years ago
Read 2 more answers
234% as a simplifed fraction
blagie [28]

Answer:

So, /(100÷2) = 117/50 when reduced to the simplest form. As the numerator is greater than the denominator, we have an IMPROPER fraction, so we can also express it as a MIXED NUMBER, thus 234/100 is also equal to 2 17/50 when expressed as a mixed number.

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Simplify: 7!<br> 5,040<br> 40,320<br> 7<br> 720
Arturiano [62]
5040, I looked up the factorial of 7
8 0
3 years ago
Read 2 more answers
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