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igomit [66]
3 years ago
5

Eight male and eight female college students who have credit cards were surveyed and asked their total credit card debt. The res

ponses are given below in dollars: Males 1000 2100 900 1200 1300 500 1400 700 Females 1300 500 2000 1800 1300 1000 2600 1400
Is this an observational study or a designed experiment?
Mathematics
1 answer:
Tatiana [17]3 years ago
5 0

Answer:

Observational study.

Step-by-step explanation:

In an observational study, the data is calculated but there are no experiments to change anything.

In a designed experiment, an experiment is applied to a group of people and it's effects are studied.

In this problem, we have that:

Male and female college students give their total credit card debt. There are no experiments to change anything. So it is an observational study.

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Donald's Earnings, x (dollars) Fallons Earnings, y 38 45 43 50 48 55 53 60 58 65 Which equation best represents Fallon's earning
kherson [118]

Given:

The table of values for Fallon's earnings in terms of Donald's earnings.

To find:

The equation that best represents Fallon's earnings in terms of Donald's earnings.

Solution:

In the given table the x-values are increasing by 5 units and  y values increasing by 5 units. It means the rate of change of y with respect to x is constant and the table represents a linear function.

If the graph of a linear function passes through two points, then the equation of linear function is

y-y_1=\dfrac{y_2-y_1}{x_2-x_1}(x-x_1)

Consider any two points from the table. Let the two points are (38,45) and (43, 50). Then, the equation is

y-45=\dfrac{50-45}{43-38}(x-38)

y-45=\dfrac{5}{5}(x-38)

y-45=1(x-38)

y-45=x-38

Adding 45 on both sides, we get

y=x-38+45

y=x+7

Therefore, the correct option is A.

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3 years ago
Suppose you work for a life insurance company. At your job, you use the following table, which shows the number of people out of
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3 years ago
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4, Find a number x such that x = 1 mod 4, x 2 mod 7, and x 5 mod 9.
olchik [2.2K]

4, 7 and 9 are mutually coprime, so you can use the Chinese remainder theorem.

Start with

x=7\cdot9+4\cdot2\cdot9+4\cdot7\cdot5

Taken mod 4, the last two terms vanish and we're left with

x\equiv63\equiv64-1\equiv-1\equiv3\pmod4

We have 3^2\equiv9\equiv1\pmod4, so we can multiply the first term by 3 to guarantee that we end up with 1 mod 4.

x=7\cdot9\cdot3+4\cdot2\cdot9+4\cdot7\cdot5

Taken mod 7, the first and last terms vanish and we're left with

x\equiv72\equiv2\pmod7

which is what we want, so no adjustments needed here.

x=7\cdot9\cdot3+4\cdot2\cdot9+4\cdot7\cdot5

Taken mod 9, the first two terms vanish and we're left with

x\equiv140\equiv5\pmod9

so we don't need to make any adjustments here, and we end up with x=401.

By the Chinese remainder theorem, we find that any x such that

x\equiv401\pmod{4\cdot7\cdot9}\implies x\equiv149\pmod{252}

is a solution to this system, i.e. x=149+252n for any integer n, the smallest and positive of which is 149.

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Answer:

Step-by-step explanation:

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