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3 years ago

Whats the property of 2+3=3+2

Mathematics

1 answer:

Damm [24]3 years ago

6 0

The property that is being used is the commutative property.

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Please help me marking brainlist <br> please explain how u got the answer

ss7ja [257]

Answer
v=-35

explanation
add -4 and -31 to get v which is -35

5 0

2 years ago

Maria brought home a sandwich that was 6 1/8 feet long to share with 4 members of her family. If each person, including Maria, a

mamaluj [8]

There are 5 people. Each ate the same amount. So it is 1/5 of the sandwich. 6.125/5=1.225 feet

6 0

3 years ago

Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p. n equals

Alekssandra [29.7K]

Answer:

(0.767,0.833)

Step-by-step explanation:

The 95% confidence interval for population proportion p can be computed as

$p-z_{\frac{\alpha }{2} } \sqrt{\frac{pq}{n} }$

The z-value associated with 95% confidence level is 1.96.

whereas p=x/n

We are given that x=440 and n=550.

p=440/550=0.8

$0.8-1.96\sqrt{\frac{0.8(0.2)}{550} }$

$0.8-1.96\sqrt{\frac{0.16}{550} }$

$0.8-1.96\sqrt{0.00029 }$

$0.8-1.96(0.01706)$

$0.8-0.03343$

$0.76657$

Thus, the required confidence interval is

0.767<P<0.833 (rounded to 3 decimal places)

Hence, we are 95% confident that our true population proportion will lie in the interval (0.767,0.833)

3 0

3 years ago

Solve for the given variable<br><br> 1. <img src="https://tex.z-dn.net/?f=f%3D%20%5Cfrac%7B9%7D%7B5%7Dc%2B32%20%20" id="TexFormu

olga2289 [7]

$f=\frac{9}{5}c+32\\
5f=9c+160\\
9c=5f-160\\
c=\frac{5f-160}{9}
$

8 0

3 years ago

A researcher at the University of Washington medical school believes that energy drink consumption may increase heart rate. Supp

Nana76 [90]

Answer:

Step-by-step explanation:

Given that:

mean μ = 70

sample size = 25

sample mean = 73

standard deviation = 7

level of significance = 0.10

The null hypothesis and the alternative hypothesis can be computed as follows:

$\mathtt{H_o : \mu = 70} \\ \\ \mathtt{H_1 : \mu > 70 }$

The z score for this statistics can be calculated by using the formula:

$z = \dfrac{X- \mu}{\dfrac{\sigma}{\sqrt{n}}}$

$z = \dfrac{73- 70}{\dfrac{7}{\sqrt{25}}}$

$z = \dfrac{3}{\dfrac{7}{5}}$

$z = \dfrac{3 \times 5}{{7}{}}$

z = 2.143

At level of significance of 0.10

degree of freedom = n -1

degree of freedom = 25 - 1

degree of freedom = 24

The p - value from the z score at level of significance of 0.10 and degree of freedom of 24 is:

P - value = 1 - (Z < 2.143)

P - value = 1 - 0.9839

P - value = 0.0161

Decision Rule: since P value is lesser than the level of significance, we reject the null hypothesis.

Conclusion: We conclude that energy drink consumption increases heart rate.

5 0

3 years ago