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3 years ago

I WILL GIVE BRAINLIEST ANSWER TO THE CORRECT ANSWER!! PLEASE ASAP

Mathematics

1 answer:

Vaselesa [24]3 years ago

3 0

Answer:

1.5

Step-by-step explanation:

the slope is regarded as :

= $\frac{y2-y1}{x2-x1}$

this is also known as the <em>gradient </em>, meaning the differences of two y values divided by the differences of the two corresponding x values

take two values on the slope and put in the form ( x,y)

we shall use two points A and B

A = (80 , 100)

B = (20 , 10)

now use the formula:

$\frac{10-100}{20-80}$

= $\frac{-90}{-60}$

= $\frac{3}{2}$

also can be represented into an integer form

answer is <u>1.5</u>

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Ruth has a beaker containing a solution of 800 mL of acid and 200 mL of water. She thinks the solution is a little strong, so sh

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Answer:

Step-by-step explanation:

Ok so the beaker is 200 water:800 acid

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100:700

Then she adds 200 water:

300:700

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3 years ago

In a school, 130 students are sixth graders. If 52% of the students in the school are sixth graders, how many students are there

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3 years ago

The desired percentage of SiO2 in a certain type of aluminous cement is 5.5. To test whether the true average percentage is 5.5

miskamm [114]

Answer:

z=-3.25

$p_v =2*P(z$

Step-by-step explanation:

1) Data given and notation

$\bar X=5.24$ represent the mean production for the sample

$\sigma=0.32$ represent the sample standard deviation for the sample

$n=16$ sample size

$\mu_o =5.5$ represent the value that we want to test

$\alph=0.05a$ represent the significance level for the hypothesis test.

z would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

Part a: State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean production is different from 5.5 tons, the system of hypothesis would be:

Null hypothesis: $\mu =5.5$

Alternative hypothesis: $\mu \neq 5.5$

If we analyze the info given we know the population deviation so is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

$z=\frac{5.24-5.5}{\frac{0.32}{\sqrt{16}}}=-3.25$

P-value

Since this is a two side test the p value would be:

$p_v =2*P(z$

Conclusion

If we compare the p value and the significance level given $\alpha=0.05$ we see that $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, so we can conclude that the production its significant different compared to the desired percentage of SiO2 of 5.5 at 5% of signficance.