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4 years ago

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2 answers:

Alekssandra [29.7K]4 years ago

7 0

Answer:

really. does it have unlimited searches

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lilavasa [31]4 years ago

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Okay

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The value of a collectible is changing such that dv/dt = 2t/(sqrt(t^2+1)) given in 4/year, and t is the number of years from 200

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Diviértete tratando de conseguirlo porque no sé, así que sí, pero no

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3 years ago

What is the percent of 0.250

KiRa [710]

25% because the 0.25, the "25," are on the right hand side of the decimal point, that means they are 25 HUNDRETHS of a whole "one." key word: hundred. so therefore, it is 25%

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3 years ago

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The lengths of three sides of a quadrilateral are shown below:

pentagon [3]

In part A, we need to solve for the total length of sides 1, 2 and 3.
Since all three sides measurements are given, we have the solution below:
Sides123 = Side 1 + Side 2 + Side 3
Sides123 = (3y² + 2y - 6) + (4y² + 3y -7) + (5y² + 4y -8)
Sides123 = 12y² + 9y - 21
This is the total length of sides 1,2 and 3 "12y² + 9y - 21"

In part B, we need to solve for the length of the fourth side and the solution is shown below:
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Side 4 = (4y³ + 18y² + 16y -26) / 12y² + 9y -21

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3 years ago

Which expressions are equivalent to 2(4x−3)+3x−12(4x−3)+3x−1

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3 years ago

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An industrial expert claims that the average useful lifetime of a typical car transimssion which comes with ten years warranty i

lesya692 [45]

Answer:

a. none of these answers

Data provides sufficient evidence, at 1% significance level, to support the expert's claim. In addition the p-value (or the observed significance level) is equal to P( T >3.281)

Step-by-step explanation:

Data given and notation

$\bar X=13.5$ represent the mean height for the sample

$s=3.2$ represent the sample standard deviation for the sample

$n=9$ sample size

$\mu_o =10$ represent the value that we want to test

$\alpha=0.01$ represent the significance level for the hypothesis test.

t would represent the statistic (variable of interest)

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

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is higher than 10 years, the system of hypothesis would be:

Null hypothesis: $\mu \leq 10$

Alternative hypothesis: $\mu > 10$

If we analyze the size for the sample is < 30 and we don't know the population deviation so is better apply a t test to compare the actual mean to the reference value, and the statistic is given by:

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

t-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:

$t=\frac{13.5-10}{\frac{3.2}{\sqrt{9}}}=3.28$

P-value

The first step is calculate the degrees of freedom, on this case:

$df=n-1=9-1=8$

Since is a one side right tailed test the p value would be:

$p_v =P(t_{(8)}>3.281)=0.00558$

Conclusion

If we compare the p value and the significance level given $\alpha=0.01$ we see that $p_v$ so we can conclude that we have enough evidence to reject the null hypothesis, so we can't conclude that we have a mean higher than 10 years at 1% of significance.

a. none of these answers

3 0

3 years ago