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barxatty [35]
3 years ago
11

A researcher investigated whether following a vegetarian diet could help to reduce blood pressure. For a sample of 85 people who

followed a vegetarian diet for 4 months, the mean systolic blood pressure was 124 mmHg. For a sample of 75 people who followed a non-vegetarian diet for 4 months, the mean systolic blood pressure was 138 mmHg. Methods of statistics show that if a vegetarian diet had no effect on blood pressure, there would be less than 1 chance in 100 of getting these results. Does the result have statistical significance? Why or why not? Does the result have practical significance?
Mathematics
1 answer:
3241004551 [841]3 years ago
6 0

Answer:

Yes, the result does not have statistical significance

Yes, the result has practical significance

Step-by-step explanation:

An experiment or claim may be said to be statistically significant if it's occurence is likely not due to chance for a certain level of stated significance. From the scenario described, it is stated that if vegetarian diet has no effect on blood, then the result obtained wipukd likely occur in less Than 1 of 100 ; this is < 0.01. This means that the effect of vegetarian diet on blood could not have occurred by chance. Hence, result is statistically significant.

The result does have practical significance too, since there is a distinctive difference in blood pressure of non - vegetarians(138mmHg) and Vegetarians (124mmHg).

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If I won 72 million on slots and I won 120 times my bet. How much was I betting per spin?
Montano1993 [528]

Answer:

You would of had to be betting $600,000

Step-by-step explanation:

7 0
3 years ago
Using the graph of f(x) below, find limit as x approaches negative 1 of f of x. (4 points)
Rama09 [41]

Answer:

The limit of the function as x approaches to -1, is -1 and the option 4 is correct.

Step-by-step explanation:

According the the definition of limit, if,

L=\lim_{x\rightarrow a^+}f(x)=\lim_{x\rightarrow a^-}f(x)

Then the limit of function exist. Either the function is defined or not on the point a. If the at point a the value value of function is L, then the function is continuous.

From the given graph it is easily noticed that the value of f(x) approaches to -1 as x approaches to -1 from left or left. At x=-1 there is a open circle on (-1,-1), therefore this is not included in the function.

The value of f(x) is 2 at x=-1 because of the point (-1,-2).

\lim_{x\rightarrow -1^+}f(x)=\lim_{x\rightarrow -1^-}f(x)=-1

Therefore the limit of the function exist and the limit of the function is -1.

7 0
3 years ago
It is found experimentally that the electric field in a certain region of Earth's atmosphere is directed vertically down. At an
sweet-ann [11.9K]

Answer:

1.176604*10^{-10} C

Step-by-step explanation:

This is flux problem (see diagram below)

Since electric field is vertical to the top and bottom of the cube. total flux will be sum of flux up and down i-e

Фtotal=Фup + Фdown = Ф 260 + Ф150

But flux is given by scalar product of Electric field and area

Ф=E.A= EA cos∅

where ∅ is the angle between two vector quantities E the electric field and A the area vector. So, total flux is

Фtotal = =E_{260} .A+E_{150} .A

=E_{260} *A cos \alpha +E_{150} *A cos \beta

=E_{260} * Acos(180)+E_{150} * Acos(0)

=-E_{260} .A  +E_{150} .A

=A(E_{150} -E_{260} )

But we know that according to Gausse's Law total flux is given by;

Total flux = q / ∈

==> q= ∈(Total flux)

q = 8.84 *10^{-12} *110^{2} (260-150)

q=1.176604 *10^{-10} C

4 0
3 years ago
2x+9=3(4x-7) help show work
ivann1987 [24]

Answer:

2x+9=12x-21

-2.      -2

9=10x -21

+21           +21

30=10x

Divide by 10 on both sides

30/10

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Step-by-step explanation:

3 0
4 years ago
You could divide any rectangle into two right triangles. How is knowing this useful?
Vlad1618 [11]
It makes it so that you can solve for the sides and such of a triangle using theorems specific to right triangles.
7 0
4 years ago
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