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3 years ago

PLEASE HELP ME SOMEONE PLEASE DO 11-20 FOR ME PLEASE

Mathematics

1 answer:

Keith_Richards [23]3 years ago

3 0

11:2b-3 12:6+9/p 13: c/4+7 14: 13y-1 15: w/8-k 16: I'm not sure 17: 9+3x 18:12+2/3h 19: 16+g/18 20:y/12+7

hope this helps a little at least❤️❤️

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A high school runs a survey asking students if they participate in sports. The results are found below. Run an independence test

Sveta_85 [38]

Answer:

It can be concluded that participation in sports is dependent on grade level.

Step-by-step explanation:

In this case a Chi-square independence test for the data is to be performed at α = 0.01.

The hypothesis can be defined as follows:

H₀: The participation in sports is independent of grade level.

Hₐ: The participation in sports is dependent of grade level.

The data provided is:

Freshmen Sophomores Juniors Seniors

Yes 75 88 55 42

No 30 28 38 40

The formula to compute the expected frequencies is:

$E_{i}=\frac{i^{th}\ \text{Row Total}\ \times\ i^{th}\ \text{Column Total}}{N}$

The Chi-square statistic is:

$\chi^{2}=\sum {\frac{(O_{i}-E_{i})^{2}}{E_{i}}}$

Consider the Excel file attached below.

The value of Chi-square statistic is 16.244.

The degrees of freedom of the test are:

$\text{df}=(r-1)(c-1)$

$=(4-1)(2-1)\\=3\times 1\\=3$

Compute the p-value of the test as follows:

$p-value=P(\chi^{2}_{df}$

$=P(\chi^{2}_{3}$

*Use a Chi-square table.

p-value = 0.001 < α = 0.01

The null hypothesis will be rejected at 1% level of significance.

Thus, it can be concluded that participation in sports is dependent on grade level.

4 0

4 years ago

<img src="https://tex.z-dn.net/?f=6y%20-%208%20%2B%202" id="TexFormula1" title="6y - 8 + 2" alt="6y - 8 + 2" align="absmiddle" c

lutik1710 [3]

so it will end up at 6y-6

you need to combine everything that does not have an exponent (example. a, x, y) and you combine the ones that have exponents together. and therefore you get 6y-6 (remember positive and negative signs)

8 0

3 years ago

One way to compute a 20% tip for a bill is to multiply it by 0.20. A restaurant bill was $35.70. Calculate the tip.

Dafna1 [17]

Answer:

7.14

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

What is 3x-1<-25 solve

yan [13]

Answer:

x < -8

Step-by-step explanation:

To solve this inequality you would need to isolate the variable x.

Add 1 to both sides of the inequality.

3x < -24

Divide both sides of the inequality by 3.

x < -8

8 0

3 years ago

Solve each equation.SHOW work plz

Studentka2010 [4]

$3 \frac{1}{2} r = 28 \\ \frac{7}{2} r = 28 \\ \frac{ \frac{7}{2} }{ \frac{7}{2} } r = \frac{28}{ \frac{7}{2} } \\ r = \frac{ \frac{56}{2} }{ \frac{7}{2} } \\ r= \frac{56}{7}$

$1 \frac{1}{2} c =6 \\ \frac{3}{2} c= \frac{12}{2} \\ \frac{ \frac{3}{2} }{ \frac{3}{2} } c= \frac{ \frac{12}{2} }{ \frac{3}{2} } \\ c= \frac{ \frac{12}{2} }{ \frac{3}{2} } = \frac{12}{3} =4 \\ c=4$

7 0

3 years ago