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3 years ago

Does each situation describe a survey, an experiment, or an observational study?

Mathematics

2 answers:

lions [1.4K]3 years ago

5 0

Patients who visit a clinic for the first time are asked to answer 15 questions about their health history.

Survey

A researcher randomly chooses 20 patients who come to the clinic with the flu and gives them an experimental drug. A randomly chosen group of 20 patients who come in with the flu receive a placebo.

Experiment

A doctor at the clinic asks patients who come in with a headache how many hours of sleep they get on a typical night.

Observational Study

vampirchik [111]3 years ago

5 0

Answer:

A survey : survey sampling is the process of selecting a sample of elements from a target population to conduct any survey.

An experiment : an experiment is a procedure that can be infinitely repeated and can have many possible outcomes.

An observational study - observational studies are done to understand cause and effect relationships.

Survey - Patients who visit a clinic for the first time are asked to answer 15 questions about their health history.

Experiment - A researcher randomly chooses 20 patients who come to the clinic with the flu and gives them an experimental drug. A randomly chosen group of 20 patients who come in with the flu receive a placebo.

Observational Study - A doctor at the clinic asks patients who come in with a headache how many hours of sleep they get on a typical night.

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A pole 11 feet tall is used to support a guy wire for a tower, which runs from the tower to a metal stake in the ground. After p

umka21 [38]

Answer:

48 ft

Step-by-step explanation:

Here, we want to find the length of the wire

from the diagram, we can identify two similar triangles

The smaller one and a bigger one

Mathematically, when two triangles are similar, the ratio of their corresponding sides are equal

We can start by getting the height of the tower

we have this as:

8/11 = 28/x

8 * x = 28 * 11

8x = 308

x = 308/8

x = 38.5 ft

So as we can see, the wire represents the hypotenuse of the larger triangle that measures 28 ft base and 38.5 ft height

So we can use the Pythagoras’ theorem to get the hypotenuse

Let us call this g

mathematically according to the theorem, the square of the hypotenuse equals the sum of the squares of the two other sides

thus, we have it that;

g^2 = 38.5^2 + 28^2

g^2 = 2,266.25

g = √2,266.25

g = 47.61 which is approximately 48 ft

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3 years ago

Worried about going over his storage limit, Connor monitored the number of undeleted voicemail messages stored on his phone each

kondaur [170]

Answer: asdfryhjklkjhdn

Step-by-step explanation:

sfnjhmjndghegfnf fsdg mfnfc nfb

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3 years ago

Which of these is equivalent to the given angle?<br> A) 73.6°<br> B) 110°<br> C) 147.3°<br> D) 220°

mote1985 [20]

The answer is definitely d!!

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3 years ago

A rectangle with a width of 2.5 cm and a length of 3 cm is dilated by a scale factor of 4. Which statements about the new

steposvetlana [31]

Answer:

Below.

Step-by-step explanation:

The dimensions will be 10 * 12.

(each new dimension will be 4 times the original)

The new perimeter will be 4 times the original.

The new area will be 16 times the original ( 4 * 4 = 16).

The new perimeter will be 44 cm.

6 0

3 years ago

Read 2 more answers

Involving selecting balls from a box of numbered balls. Assume that the box contains balls numbered from 1 through 28, and that

balu736 [363]

Answer:4

Step-by-step explanation:

Let a denotes the no of odd ball selected and b denotes the no of even ball selected

then $X=3 a+4 b$

for $a=0,b=3, X=12$

for $a=1,b=2, X=11$

for $a=2,b=1, X=10$

for $a=3,b=0, X=9$

thus X can take 4 values i.e. 9,10,11 and 12

$P(X=9)\ i.e. 3\ odd\ balls\ and\ 0\ even\ balls=\frac{^{14}C_{3}}{^{28}C_3}=\frac{1}{9}$

$P(X=10)\ i.e. 2\ odd\ balls\ and\ 1\ even\ balls=\frac{^{14}C_{2}\times ^{14}C_1}{^{28}C_3}=\frac{7}{18}$

$P(X=11)\ i.e. 1\ odd\ balls\ and\ 2\ even\ balls=\frac{^{14}C_{1}\times ^{14}C_2}{^{28}C_3}=\frac{7}{18}$

$P(X=12)\ i.e. 0\ odd\ balls\ and\ 3\ even\ balls=\frac{^{14}C_{3}}{^{28}C_3}=\frac{1}{9}$

7 0

4 years ago