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ki77a [65]
3 years ago
15

(Press this if you don't see it) I need help on number six and seven.

Mathematics
1 answer:
KIM [24]3 years ago
5 0
For number six, the sail is 3 ft tall.

Base x Height x (1/2) = a
2.5 x 3 x (1/2) = 3.75
7.2 x (1/2) = 3.75
<span>3.5 = 3.5 </span>
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PLEASE I NEED HELP!!! A triangle in the coordinate plane has coordinates of (3,5), (1,-3), and (-3, 4). It is translated so that
rodikova [14]
A) it moved left 2, so -2, and up 2
5 0
3 years ago
Write the equations of a line through the point (-3,-8) with a slope of -3/5 in
kompoz [17]

y=mx+b is the standard function for any straight line

y and x are constants, so they never change in the final form

m is the slope, which is given

b is the y intercept, which is not given

we have to plug in the values to find the solution, so plug in the (x,y) coordinates for their respective places in the equation

-8 = (-3/5)(-3) + b

-8 = 1.8 + b

-9.8 = b

now that we have b, we can just put the slope back in for m and get the answer

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4 0
2 years ago
A sample of 41 observations is selected from one population with a population standard deviation of 3.4. The sample mean is 100.
Marizza181 [45]

Answer:

a) If we see the alternative hypothesis we see that we are conducting a bilateral test or two tail.

b) (-1.9886, 1.9886)

c) t=\frac{(100 -98.4)-(0)}{\sqrt{\frac{3.4^2}{41}}+\frac{5.6^2}{45}}=1.617

d) p_v =2*P(t_{84}>1.617) =0.1096

So with the p value obtained and using the significance level given \alpha=0.05 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the mean of the group 1 is NOT significantly different than the mean for the group 2.  

e) p_v =2*P(t_{84}>1.617) =0.1096

We can use the following excel code to calculate it: "=2*(1-T.DIST(1.617;84;TRUE))"

Step-by-step explanation:

The system of hypothesis on this case are:

Null hypothesis: \mu_1 = \mu_2

Alternative hypothesis: \mu_1 \neq \mu_2

Or equivalently:

Null hypothesis: \mu_1 - \mu_2 = 0

Alternative hypothesis: \mu_1 -\mu_2\neq 0

Our notation on this case :

n_1 =41 represent the sample size for group 1

n_2 =45 represent the sample size for group 2

\bar X_1 =100 represent the sample mean for the group 1

\bar X_2 =98.4 represent the sample mean for the group 2

s_1=3.4 represent the sample standard deviation for group 1

s_2=5.6 represent the sample standard deviation for group 2

Part a

If we see the alternative hypothesis we see that we are conducting a bilateral test or two tail.

Part b

On this case since the significance level is 0.05 and we are conducting a bilateral test we have two critical values, and we need on each tail of the distribution \alpha/2 = 0.025 of the area.

The distribution on this cas since we don't know the population deviation for both samples is the t distribution with df=n_1+n_2 -2= 41+45-2=84 degrees of freedom.

We can use the following excel codes in order to find the critical values:

"=T.INV(0.025,84)", "=T.INV(1-0.025,84)"

And we got: (-1.9886, 1.9886)

Part c

The statistic is given by this formula:

t=\frac{(\bar X_1 -\bar X_2)-(\mu_{1}-\mu_2)}{\sqrt{\frac{s^2_1}{n_1}}+\frac{S^2_2}{n_2}}

And now we can calculate the statistic:

t=\frac{(100 -98.4)-(0)}{\sqrt{\frac{3.4^2}{41}}+\frac{5.6^2}{45}}=1.617

The degrees of freedom are given by:

df=41+45-2=84

Part d

And now we can calculate the p value using the altenative hypothesis:

p_v =2*P(t_{84}>1.617) =0.1096

So with the p value obtained and using the significance level given \alpha=0.05 we have p_v>\alpha so we can conclude that we have enough evidence to FAIL to reject the null hypothesis, and we can said that at 5% of significance the mean of the group 1 is NOT significantly different than the mean for the group 2.  

Part e

p_v =2*P(t_{84}>1.617) =0.1096

We can use the following excel code to calculate it: "=2*(1-T.DIST(1.617;84;TRUE))"

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Maria has 48 crayons videos 15 to her brother how many does she have left
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Answer:

33 crayons

Step-by-step explanation:

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A

Step-by-step explanation:

PLS GIVE BRAINLIEST!

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