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fenix001 [56]
2 years ago
10

Can someone please help with my math :I !!

Mathematics
1 answer:
sleet_krkn [62]2 years ago
4 0

Answer:

go to the right 2 and up 6

Step-by-step explanation:

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Suppose that each observation in a random sample of 100 fatal bicycle accidents in 2015 was classified according to the day of t
liraira [26]

Answer:

The calculated χ² =  0.57   does not fall in the critical region χ² ≥  12.59  so we fail to reject the null hypothesis and conclude the proportion of fatal bicycle accidents in 2015 was the same for all days of the week.

Step-by-step explanation:

1) We set up our null and alternative hypothesis as

H0:  proportion of fatal bicycle accidents in 2015 was the same for all days of the week

against the claim

Ha:  proportion of fatal bicycle accidents in 2015 was not the same for all days of the week

2) the significance level alpha is set at 0.05

3) the test statistic under H0 is

χ²= ∑ (ni - npi)²/ npi

which has an approximate chi square distribution with ( n-1)=7-1=  6 d.f

4) The critical region is χ² ≥ χ² (0.05)6 = 12.59

5) Calculations:

χ²= ∑ (16- 14.28)²/14.28 + (12- 14.28)²/14.28 + (12- 14.28)²/14.28 + (13- 14.28)²/14.28 + (14- 14.28)²/14.28 + (15- 14.28)²/14.28 + (18- 14.28)²/14.28

χ²= 1/14.28 [ 2.938+ 5.1984 +5.1984+1.6384+0.0784 +1.6384+13.84]

χ²= 1/14.28[8.1364]

χ²= 0.569= 0.57

6) Conclusion:

The calculated χ² =  0.57   does not fall in the critical region χ² ≥  12.59  so we fail to reject the null hypothesis and conclude the proportion of fatal bicycle accidents in 2015 was the same for all days of the week.

b.<u> It is r</u>easonable to conclude that the proportion of fatal bicycle accidents in 2015 was the same for all days of the week

6 0
3 years ago
Which of the following is a solution of x2 + 4x = −8?
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x^{2}+4x = -8&#10;\\\\&#10;x^{2}+4x+8 = 0&#10;\\\\&#10;\Delta = b^{2}-4ac&#10;\\\\&#10;\Delta = (4)^{2}-4 \cdot (1) \cdot (8)&#10;\\\\&#10;\Delta = 16-32&#10;\\\\&#10;\Delta = -16

There's no solution in the set of real numbers.

\boxed{S = \{ \ \ \}}
6 0
3 years ago
Find the measure of the given arc in Circle C.
IRINA_888 [86]

Answer:

AE=90°

AED=140°

DBA=220°

4 0
2 years ago
Marvin was buying soil for his flower garden. What would be the most reasonable amount of soil he would need to buy for a flower
muminat

Answer:

60 liters

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
What relationship do the ratios of sin x° and cos y° share?
puteri [66]

Answer:

The ratios are both identical (3/5 and 3/5).

Step-by-step explanation:

sin x° is equivalent to O/H, or the opposite/hypotenuse sides of the triangle. Therefore:

sin x° = 3/5.

cos y° is equivalent to A/H, or the adjacent/hypotenuse sides of the triangle.

cos y° = 3/5.

\frac{3}{5} =\frac{3}{5}

The ratios are identical.

8 0
2 years ago
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