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blondinia [14]
2 years ago
10

A Lake Tahoe Community College instructor is interested in the mean number of days Lake Tahoe Community College math students ar

e absent from class during a quarter. The instructor takes her sample by gathering data on five randomly selected students from each Lake Tahoe Community College math class. Which type of sampling did she use?
Mathematics
1 answer:
Ipatiy [6.2K]2 years ago
6 0

Answer:

She used the simple random sampling technique because there was no condition attached to the samples she took.

Step-by-step explanation:

we have basically four types of sampling

1.Simple random sampling.

2.Systematic sampling.

3.Stratified sampling.

4.Cluster sampling.

simple Random sampling: is a sampling technique where every item in the population has an even chance and likelihood of being selected in the sample.

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Drag the tiles to the correct boxes to complete the pairs not all tiles will be used match each quadratic graph to its respectiv
ch4aika [34]

Answer:

Part 1) The function of the First graph is f(x)=(x-3)(x+1)

Part 2) The function of the Second graph is f(x)=-2(x-1)(x+3)

Part 3) The function of the Third graph is f(x)=0.5(x-6)(x+2)

See the attached figure

Step-by-step explanation:

we know that

The quadratic equation in factored form is equal to

f(x)=a(x-c)(x-d)

where

a is the leading coefficient

c and d are the roots or zeros of the function

Part 1) First graph

we know that

The solutions or zeros of the first graph are

x=-1 and x=3

The parabola open up, so the leading coefficient a is positive

The function is equal to

f(x)=a(x-3)(x+1)

Find the value of the coefficient a

The vertex is equal to the point (1,-4)

substitute and solve for a

-4=a(1-3)(1+1)

-4=a(-2)(2)

a=1

therefore

The function is equal to

f(x)=(x-3)(x+1)

Part 2) Second graph

we know that

The solutions or zeros of the first graph are

x=-3 and x=1

The parabola open down, so the leading coefficient a is negative

The function is equal to

f(x)=a(x-1)(x+3)

Find the value of the coefficient a

The vertex is equal to the point (-1,8)

substitute and solve for a

8=a(-1-1)(-1+3)

8=a(-2)(2)

a=-2

therefore

The function is equal to

f(x)=-2(x-1)(x+3)

Part 3) Third graph

we know that

The solutions or zeros of the first graph are

x=-2 and x=6

The parabola open up, so the leading coefficient a is positive

The function is equal to

f(x)=a(x-6)(x+2)

Find the value of the coefficient a

The vertex is equal to the point (2,-8)

substitute and solve for a

-8=a(2-6)(2+2)

-8=a(-4)(4)

a=0.5

therefore

The function is equal to

f(x)=0.5(x-6)(x+2)

3 0
3 years ago
2. Fred has twice as much money
lys-0071 [83]

J=amount Jake has; F=amount Fred has=2J

J+F=$54

J+2J=$54

3J=$54

J=$18

ANSWER 1: Jake has $18.

F=2J=2($18)=$36 ANSWER 2: Fred has $36.

4 0
2 years ago
Im confused... what do I do this?? (Just 14 btw) thank youuuuu
user100 [1]

Answer:

1=-1/5 2=11/20 3=149/25

Step-by-step explanation:

I get it you have to put the number into your calculator then turn it into a fraction

hop this helps

-mercury

8 0
3 years ago
Read 2 more answers
Mr. Ramos pays 22% of his income for housing. If Mr. Ramos pays $11,000 for housing, how much money did he earn during the year
Nataly [62]

Answer:

2420

Step-by-step explanation:

11000 times .22 = 2420

5 0
3 years ago
Read 2 more answers
15 less than five of a certain number are fifty more than 10 times of that number. What is the number?
Svetradugi [14.3K]

Answer:its 8

Step-by-step explanation:

8 0
3 years ago
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