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Alekssandra [29.7K]
2 years ago
7

If a:b = 3:4 and b:c= 5:7, find a:c. WORKING OUT NEEDED.

Mathematics
1 answer:
mixer [17]2 years ago
5 0

Answer:

3:7

Step-by-step explanation:

a:b

a=3

b=4

b:c

b=5

c=7

a:c

3:7

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In a simple regression analysis for a given data set, if the null hypothesis β = 0 is rejected, then the null hypothesis ρ = 0 i
kati45 [8]

Answer:

Null hypothesis: \rho =0

Alternative hypothesis: \rho \neq 0

The statistic to check the hypothesis is given by:

t=\frac{r \sqrt{n-2}}{\sqrt{1-r^2}}

And is distributed with n-2 degrees of freedom

And the statistic to check the significance of a coeffcient in a regression is given by:

t_1 = \frac{\hat{\beta_1} -0}{S.E (\hat{\beta_1})}

For this case is importantto remember that t1 and p value for test of slope coefficient is the same test statistic and p value for the correlation test so then the answer would be:

Always

Step-by-step explanation:

In order to test the hypothesis if the correlation coefficient it's significant we have the following hypothesis:

Null hypothesis: \rho =0

Alternative hypothesis: \rho \neq 0

The statistic to check the hypothesis is given by:

t=\frac{r \sqrt{n-2}}{\sqrt{1-r^2}}

And is distributed with n-2 degrees of freedom

And the statistic to check the significance of a coeffcient in a regression is given by:

t_1 = \frac{\hat{\beta_1} -0}{S.E (\hat{\beta_1})}

For this case is importantto remember that t1 and p value for test of slope coefficient is the same test statistic and p value for the correlation test so then the answer would be:

Always

4 0
2 years ago
What is the slope of the line through (0,-1) and (2,3)?
aniked [119]
Slope = (y2-y1)/(x2-x1)
(3+1)/(2-0) = 4/2 = 2
The slope is 2
3 0
2 years ago
Simplify 18/3 divided by -2/6. Select one: a. −8 b. −4 c. 4 d. 8
OLEGan [10]

Answer:

-18

Step-by-step explanation:

18/3=6

6/ -2/6

=6* 6/-2

=-18

7 0
3 years ago
Read 2 more answers
1. For a 30 student speech course, in how many ways can the student be selected to give the first 5 speeches?
liraira [26]

Combination problem:

1) 30 C 5 = 142506

2) 13 C 4 = 715

8 0
3 years ago
15. The price of a ticket for your office Christmas party is $17.75. So far you've sold 28 tickets. How much money should you ha
Marina CMI [18]
17.75 x 28 = 497
you answer is C
5 0
3 years ago
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