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Katena32 [7]
3 years ago
9

Determine if the following statement is true or false.​ Why? The expected frequencies in a​ chi-square test for independence are

found using the formula below.
Expected frequency = (row total)(column total) / table total
Choose the correct answer below.
1. False. This formula gives the expected proportion. The (table total) factor in the denominator on the right should be squared.
2. True. It is a simplification of multiplying the proportion of a row variable by the proportion of the column variable to find the proportion for a cell, then multiplying by the table total.
3. True. The area to the right of this value in the corresponding chi-square distribution gives the P-value for the test.
4. False. The expected frequencies for a chi-square test are given by Oi - Ei/ Ei where i represents cell number.
Mathematics
1 answer:
a_sh-v [17]3 years ago
6 0

Answer:

Step-by-step explanation:

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Konichiwa~! My name is Zalgo and I am here to help you out today. If f were to equal -3, first we need to put -3 into the equation. It would look like "f(-3)=x^2". The answer to that equation is 9.

I hope that this helps! :T

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8 0
3 years ago
What percent of 19 is 4.75?
IrinaK [193]

Answer:

25%

Step-by-step explanation:

1. 4.75/19 = .25

2. .25 = 25%

8 0
3 years ago
Use the graph of f(x) = log x to obtain the graph of g(x) = log x + 5.
galina1969 [7]

The graph of g(x) = f(x) + 5 will have the graph of f(x) moved 5 units upward. The best choice is the last one.

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Adding 5 to each y-value (the output of f(x)) moves it upward by 5 units.

8 0
3 years ago
Read 2 more answers
PLS HELP 25 POINTS thanks uou​
maw [93]

Answer:

top: 2.6 units²

bottom: 2.83 units²

Step-by-step explanation:

so you need to know a couple of things

1) the inscribed polygons are made up of isoceles triangles (the top one has 6 and the bottom one has 8 triangles)

2) we know the length of each side of the isosceles triangles (given as r = 1 for all triangles)

3) we know that the entire circle is 360 degrees and therefore the angle of segment of the pie is 360° ÷ number of triangles in each circle

for the top, each segment has an angle of 360°÷6 = 60°

for the bottom, each segment has an angle of 360° ÷ 8 = 45°

4) We can find the area of a triangle if we know two sides and the angle between the two known sides using the following formula

Area = (1/2) x (Length 1) x (Length 2) x sin (angle between them)

In our case, we know that the length of each side is the same length 1 and the angle between them is either 60° (for top) and 45° (for bottom)

hence,

Area of each triangle = (1/2) x 1 x 1 x sin (angle)

= (1/2) sin (angle)

Area of each polygon= area of each triangle x number of triangles

= (1/2) sin (angle) x number of triangles.

For the top, each segment angle is 60° and there are 6 triangles.

Area of top polygon = (1/2) sin (60°) x 6 = 2.6 units²

For the bottom, each segment angle is 45° and there are 8 triangles.

Area of top polygon = (1/2) sin (45°) x 8 = 2.83 units²

8 0
3 years ago
, Hayley sold 20 tickets to the school play for a total of $225 early bird tickets were $10 and regular price tickets were $15 w
Lady_Fox [76]

Answer:

15 early tickets were sold and 5 regular tickets were sold.

Step-by-step explanation:

Let x be the number of early bird tickets sold and y be the number of regular tickets sold.

Total number of tickets sold = 20

Thus, we can write the equation,

x + y = 20

Cost of early bird ticket = $10

Cost of regular tickets = $15

Total cost = $225

Thus, we can write the equation,

225 = 10x + 15y

We solve the equation by elimination method by multiplying first equation by 10 and subtracting.

10x + 15y-(10x+10y) = 225 - 200\\5y = 25\\\Rightarrow y=5\\x + 5 = 20\\\Rightarrow x = 15

Thus, 15 early tickets were sold and 5 regular tickets were sold.

5 0
3 years ago
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