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4 years ago

Helppooooopeppdpdpepdpdpp

Mathematics

2 answers:

mariarad [96]4 years ago

7 0

I would say G
If you look on the graph the sales tax is following the advertising

alexandr402 [8]4 years ago

7 0

Answer:

Step-by-step explanation:

Since there is a positive correlation of points, you can say that sales tend to increase though they don't always increase.

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Listed below are the number of years it took for a random sample of college students to earn bachelor's degrees (based on data f

schepotkina [342]

Answer:

a) Mean = 6.5, sample standard deviation = 3.50

b) Standard error = 0.7826

c) Point estimate = 6.5

d) Confidence interval: (5.1469 ,7.8531)

Step-by-step explanation:

We are given the following data set for students to earn bachelor's degrees.

4, 4, 4, 4, 4, 4, 4.5, 4.5, 4.5, 4.5, 4.5, 4.5, 6, 6, 8, 9, 9, 13, 13, 15

a) Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{130}{20} = 6.5$

Sum of squares of differences = 6.25 + 6.25 + 6.25 + 6.25 + 6.25 + 6.25 + 4 + 4 + 4 + 4 + 4 + 4 + 0.25 + 0.25 + 2.25 + 6.25 + 6.25 + 42.25 + 42.25 + 72.25 = 233.5

$S.D = \sqrt{\frac{233.5}{19}} = 3.50$

b) Standard Error

$= \displaystyle\frac{s}{\sqrt{n}} = \frac{3.50}{\sqrt{20}} = 0.7826$

c) Point estimate for the mean time required for all college is given by the sample mean.

$\bar{x} = 6.5$

d) 90% Confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 19 and}~\alpha_{0.10} = \pm 1.729$

$6.5 \pm 1.729(\frac{3.50}{\sqrt{20}} ) = 6.5 \pm 1.3531 = (5.1469 ,7.8531)$

e) No, the confidence interval does not contain the value of 4 years. Thus, confidence interval is not a good estimator as most of the value in the sample is of 4 years. Most of the sample does not lie in the given confidence interval.

5 0

4 years ago

The sum of a number and 7 algebraic expression

Arisa [49]

Since it says the sum of any number not one in specific then the value will be x, plus the sum of 7,

$x + 7$

5 0

3 years ago

Find the determinant of the matrix.

Jobisdone [24]

Answer:

-276

Step-by-step explanation:

We'll use the method of cofactors. Use the coefficient +6 for

9 2

8 10

This gives you one third of the solution: 6 {(9)·(10) - (8)(2) }, or 444.

Next, use the coefficient 9, taking care to change the sign to -9 as follows:

9 1

-9 | | = -9(90 - 8) = -9(82) = -738

8 10

Finally with +2 as y our coefficient, evaluate the cofactor

9 1

9 2

ending up with

+2(18-9) = +2(9) = 18

Finally add these three results together:

+444 - 738 + 18 = -276

This, the determinant, D, is -276 (the fourth answer choice)

5 0

3 years ago

Triangle congruence and similarly (picture included) SAS, ASA, SSS, or AAS?

N76 [4]

Answer:

SAS

Step-by-step explanation:

SAS Postulate: "If two sets of corresponding sides on two triangles and there included angle are congruent, then the triangles are similar".

We see that line segments XY-ST and XZ-SR are congruent along with the included angles X and S. Therefore, we can justify that SAS fits the situation.

If this helped you, please consider giving a good rating, a thanks, and brainliest! It is greatly appreciated if you choose to do so! Thanks!

6 0

3 years ago

20 points !!! find the value of x that makes A || B.

Ket [755]

Answer:

X= 20

Step-by-step explanation:

Since the they are both interior angles they can be set equal to each other.

4 0

3 years ago