A countable set of circles can completely cover the unit square

Identify the type of sampling used. In a recent online survey, participants were asked to answer "yes" or "no" to the questio

Anastaziya [24]

Answer:

The sampling technique used is convenience sampling.

Step-by-step explanation:

Convenience sampling technique is a method of non-probability sampling that is done using the most easiest sample or the most convenient sample.

For instance, sampling the people of our neighborhood, or school or company, etc.

This type of sampling is known as non-probability sampling because each individual\participant does not have a specific probability of selection. Whereas in case of probability sampling each participant has an equal probability of being selected.

Survey that are conducted through online portals or online survey use samples that are quite easy to collect. The sample collected through online surveys is convenience sample.

The survey conducted to determine how many people were in favor of stricter gun control uses a convenience sampling technique. As it uses the most easy source to collect the sample.

Thus, the sampling technique used is convenience sampling.

7 0

3 years ago

A person stands 10 meters east of an intersection and watches a car driving towards the intersection from the north at 13 meters

In-s [12.5K]

Answer:

Therefore the rate change of distance between the car and the person at the instant, the car is 24 m from the intersection is 12 m/s.

Step-by-step explanation:

Given that,

A person stand 10 meters east of an intersection and watches a car driving towards the intersection from the north at 13 m/s.

From Pythagorean Theorem,

(The distance between car and person)²= (The distance of the car from intersection)²+ (The distance of the person from intersection)²+

Assume that the distance of the car from the intersection and from the person be x and y at any time t respectively.

∴y²= x²+10²

$\Rightarrow y=\sqrt{x^2+100}$

Differentiating with respect to t

$\frac{dy}{dt}=\frac{1}{2\sqrt{x^2+100}}. 2x\frac{dx}{dt}$

$\Rightarrow \frac{dy}{dt}=\frac{x}{\sqrt{x^2+100}}. \frac{dx}{dt}$

Since the car driving towards the intersection at 13 m/s.

so, $\frac{dx}{dt}=-13$

$\therefore \frac{dy}{dt}=\frac{x}{\sqrt{x^2+100}}.(-13)$

Now

$\therefore \frac{dy}{dt}|_{x=24}=\frac{24}{\sqrt{24^2+100}}.(-13)$

$=\frac{24\times (-13)}{\sqrt{676}}$

$=\frac{24\times (-13)}{26}$

= -12 m/s

Negative sign denotes the distance between the car and the person decrease.

Therefore the rate change of distance between the car and the person at the instant, the car is 24 m from the intersection is 12 m/s.

8 0

3 years ago

A circle has a diameter of 8 inches. What is its approximate circumference?

aleksandr82 [10.1K]

Answer:

about 25.13

Step-by-step explanation:

The formula of the circumference is 2pi * r

half of the diameter is r, r is the radius

8/2 = 4

2* pi*4

2*4 = 8

8*pi = ~25.13

7 0

3 years ago

The sum of the measures of the angles of a polygon with n sides is given find n

posledela

Answer:

The polygon has 3 sides ( a triangle).

$n=3$

Explanation:

The sum of the angles of a polygon can be written as;

$(n-2)180$

where n is the number of sides of the polygon.

Given that the sum of the angles in the polygon is 180 degree;

$\begin{gathered} (n-2)180=180 \\ n-2=\frac{180}{180} \\ n-2=1 \\ n=1+2 \\ n=3 \end{gathered}$

Therefore, the polygon has 3 sides ( a triangle).

$n=3$

6 0

1 year ago

The correlation coefficient between two variables is 0.9. How would you describe this value?

sergij07 [2.7K]

A correlation coefficient between two variables of 0.9 indicates an extremely high correlation between the two variables. 1 is the highest value this coefficient can have.

3 0

3 years ago