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pashok25 [27]
3 years ago
11

1. An AP Statistics class starts a project to estimate the average number of hours a student at their high school sleeps per nig

ht. Their high school has 1200 students, and they take a sample of the first 120 students that arrive at school on a particular day. They ask each of the 120 students how many hours of sleep they got the night before and then calculate an average. Which of the following statements is an accurate description of the elements of this survey?
Mathematics
1 answer:
Aleks [24]3 years ago
6 0

Answer:

(C) Sample: the 120 students surveyed. Population: the 1200 students at the high school. Parameter of interest: the average number of hours a student at this high school sleeps per night.

Step-by-step explanation:

The correct answer is (C). The sample is a subset of the population, and the parameter is a characteristic of the population of interest.

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The graph of a quadratic function with vertex (1,-3) is shown In the figure below . Find the domain and the range
forsale [732]

Answer:

We can not see the graph, but that does not matter.

For a function y = f(x), the domain is the set of the possible values of x that we can input in the function, and the range is the set of the possible outputs.

First, for the domain, we start assuming that the domain is the set of all real numbers.

Then we look at our function, there is a point that causes a problem?

(a problem can be a zero in a denominator, for example)

Well, we have a quadratic equation, then we can not have any "x" in a denominator, then there are not problems, which means that the domain is the set of all real numbers.

For the range we first need to find the minimum (or maximum value) of f(x).

Here we know that the vertex is (1, - 3)

If the arms of the graph open upwards, then the minimum is at the vertex, which means that the minimum value of y is y = -3

And the arms go upwards infinitely, so there is no upper limit.

Then the range is the set of all numbers such that:

-3 ≤ y

Now, if the arms of the graph open downwards, then the maximum is at the vertex, which means that the maximum of our function is at y = -3

And with similar thinking than in the above case, we can find that the range is:

R:  y ≤ -3.

6 0
3 years ago
Rectangle ABCD has a perimeter of 32 units and will be rotated about line k. What is the three-dimensional solid created?
murzikaleks [220]

Answer:

cylinder

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Use complete sentences to describe why it is necessary to do the same thing to both sides of an equation to perform valid operat
liq [111]
The reason why it is important to keep each side of a problem the same is because if you do, your problem will be unequal. This will mess the whole problem up.

Hope this Helps!
Brainliest would be appreciated :)
3 0
3 years ago
Read 2 more answers
Four squares are joined together to form one large square if the perimeter of one of the original squares of 8X units what is th
allsm [11]

Answer:

16 x units

Step-by-step explanation:

Perimeter of a original square= 8 x units

Perimeter of a square= 4× side

Side of a square = \frac{perimeter}{4}

Side of a square = \frac{8x}{4}

Side of a square= 2 x units

since four square are joined together to form a single square

So each side of a bigger square=   4 x units

Perimeter of a new bigger square= 4 × 4 x units

Perimeter of a new bigger square= 16 x units

Hence, the correct answer is 16 x units

3 0
3 years ago
A researcher is selecting lab rats for her experiment. She assigns each rat a number and picks numbers out of a hat while blindf
laiz [17]

Answer: \dfrac{76}{89}

Step-by-step explanation:

The pool of rats from which the researcher is drawing participants is composed of the following:

23 male albino rats

21 male spotted rats

35 female albino rats

11 female spotted rats

Total rats = 23+21+35+11 =90

P(male\ albino)=\dfrac{23}{90}

After drawing first rat , total rats remained = 89

P(\text{either a female albino rat or a male spotted rat})=\dfrac{35+21}{89}=\dfrac{76}{89}

The probability of choosing a male albino rat and then either a female albino rat or a male spotted rat = \dfrac{76}{89}

7 0
3 years ago
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